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Best Synonym Dictionary Definitions Terms Apps

250+ iOS apps curated and reviewed

4.1 avg rating
20 free apps
Updated August 2026

The best synonym dictionary definitions terms apps on iPhone average 4.1★ across 250+ titles — we've ranked them by what real users actually keep on their phones. Updated August 2026.

Compare top Synonym Dictionary Definitions Terms Apps (August 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Dictionary.com: English WordsDictionary.com: English WordsFree4.8★ (328K)YesNoAug 2026
2Merriam-Webster DictionaryMerriam-Webster DictionaryFree4.8★ (324K)YesYesAug 2026
3Synonym Dictionary Definitions TermsSynonym Dictionary Definitions TermsFree1.7★ (6)NoNoMay 2026
4Power ThesaurusPower ThesaurusFree4.8★ (3K)YesYesAug 2026
5Dictionary.Dictionary.Free4.8★ (15K)YesYesAug 2026
6Oxford Dictionary & ThesaurusOxford Dictionary & ThesaurusFree4.6★ (29K)NoYesAug 2026
7Etymonline English DictionaryEtymonline English DictionaryFree4.9★ (11K)YesYesAug 2026
8English Dictionary - Offline & FREEEnglish Dictionary - Offline & FREEFree—NoNoMay 2026

Top Picks for Synonym Dictionary Definitions Terms

Dictionary.com: English Words#1

Dictionary.com: English Words by Curiosity Media

Dictionary, Thesaurus, Vocab
Editor's Choice
🔍 Reference
4.8😐(328K ratings)
FreeAdsIn-App Purchases
#95in Reference
Dictionary.com: English Words screenshot 1
Dictionary.com: English Words screenshot 2
Dictionary.com: English Words screenshot 3
Dictionary.com: English Words screenshot 4
Dictionary.com: English Words screenshot 5

Access over 2 million trusted definitions and synonyms for English words. Enhance your vocabulary with daily new words, example sentences, and audio pronunciations. This app provides grammar tips and editorial content to deepen your understanding of the English language.

What We Love

  • 🚀 Robust dictionary and thesaurus
  • 🤓 Helpful resources like blogs and articles
  • 💡 Useful word games and puzzles
  • 👍 Easy to use and navigate

Room to Improve

  • 🐛 Inconsistent search results and missing definitions
  • 💸 Aggressive ads even after paid upgrades
  • 🤯 Frequent crashes and performance issues
Merriam-Webster Dictionary#2

Merriam-Webster Dictionary by Merriam-Webster, Inc.

Strong Contender
🔍 Reference
4.8😊(324K ratings)
FreeAdsIn-App Purchases
#38in Reference
Merriam-Webster Dictionary screenshot 1
Merriam-Webster Dictionary screenshot 2
Merriam-Webster Dictionary screenshot 3
Merriam-Webster Dictionary screenshot 4

Access America's most respected dictionary, updated with new words and meanings. This app offers offline access, voice search, daily vocabulary challenges, and a thesaurus. It's designed for English language reference, education, and vocabulary enhancement.

What We Love

  • 🚀 Easy to use
  • 👍 Comprehensive definitions
  • 👍 Helpful thesaurus
  • 🚀 Offline access

Room to Improve

  • 🐛 Ads can be intrusive
  • 🐛 Difficulty closing ads
  • 🐛 Repetitive game questions

More Synonym Dictionary Definitions Terms apps to explore

4
Power Thesaurus
Power Thesaurus
Power Thesaurus
Comprehensive. Fast. Reliable.
Free

Find accurate synonyms, antonyms, definitions, and related words with this comprehensive and fast thesaurus. Designed for writers, students, and professionals, it offers intuitive navigation and smart filters to help you express ideas clearly and confidently.

Ad-free PRO MembershipIntuitive navigationSmart filters
🔍 Reference
(3K)
freemium
5
Dictionary.
Dictionary.
Dictionary.
by TheFreeDictionary.com
Free

Access a comprehensive dictionary, thesaurus, and translation tool with millions of definitions and synonyms. Explore specialty dictionaries, learn new words daily, and play word games. This app offers offline access and integrates seamlessly with other applications.

Offline dictionary and thesaurusMillions of definitions and synonymsWord of the Day and Idiom of the Day
🔍 Reference
(15K)
free with in-app purchases
6
Oxford Dictionary & Thesaurus
Oxford Dictionary & Thesaurus
Oxford Dictionary & Thesaurus
Etymology & Offline Vocabulary
Free

Access a vast collection of dictionaries and thesauruses with definitions, pronunciations, and etymology. Features include offline access, advanced search options, and personalized word lists. Ideal for students, professionals, and word enthusiasts.

15 Oxford DictionariesThesaurus integrationAudio pronunciations
🔍 Reference
(29K)
free with in-app purchases
7
Etymonline English Dictionary
Etymonline English Dictionary
Etymonline English Dictionary
Dictionary to Build Vocabulary
Free

Explore the origins and history of English words with this comprehensive dictionary app. It offers instant search, related word suggestions, and an offline mode for premium users. Enhance your vocabulary and understanding of word roots.

Word origin explorationInstant search with suggestionsRelated words by root
📚 Education
(11K)
free with in-app purchases
8
English Dictionary - Offline & FREE
English Dictionary - Offline & FREE
English Dictionary - Offline & FREE
by Thi Vo
Free
📚 Education
(0)
9
Synonyms Antonyms Dictionary
Synonyms Antonyms Dictionary
Synonyms Antonyms Dictionary
English Synonyms Antonyms Word
Free

Discover English synonyms and antonyms with definitions and audio pronunciations. This app offers offline access to a curated list of words, allowing you to search, bookmark favorites, and maintain a history of your learning.

Offline access3000 curated wordsWord definitions
📚 Education
(2)
free
10
Dictiona: English Dictionary
Dictiona: English Dictionary
Dictiona: English Dictionary
Meanings, Synonyms & Words
Free
📚 Education
(0)
11
Dictionary Offline - Dict Box
Dictionary Offline - Dict Box
Dictionary Offline - Dict Box
Dictionary for All Languages
Free

This app provides an offline dictionary and translator for over 50 languages. It offers smart word suggestions, text translation in other apps, offline pronunciation, and a picture dictionary. An optional premium upgrade unlocks advanced features and an ad-free experience.

Offline dictionary & translator50+ languages supportedSmart word suggestions
🔍 Reference
(12K)
free with in-app purchases
12
Synonyms Dictionary
Synonyms Dictionary
Synonyms Dictionary
Offline Synonyms Dictionary
Free
📚 Books
(0)
13
Dictionary Application
Dictionary Application
Dictionary Application
English Dictionary
Free
📚 Education
(0)
14
Engineering Dictionary
Engineering Dictionary
Engineering Dictionary
Electrical & Electronics
Free
📚 Education
(0)
15
Dicty Slang
Dicty Slang
Dicty Slang
by Prana Apsara Wijaya
Free
📚 Books
(0)
16
OT: English Arabic Dictionary
OT: English Arabic Dictionary
OT: English Arabic Dictionary
Fast, offline and bilingual
Free
📚 Education
(0)
17
Linguin: Live Dictionary
Linguin: Live Dictionary
Linguin: Live Dictionary
Multilingual Dictionary
Free

Access definitions, slang, phrases, and idioms from over 80 languages. Enhance your language skills with usage tips, word origins, similar words, and pronunciation guides. Explore the fascinating history behind every word.

Instant definitions for words and phrasesUsage tips for correct contextWord origins and etymology
📚 Education
(0)
free
18
Dictionary Plus Plus
Dictionary Plus Plus
Dictionary Plus Plus
Dictionary with explanation
Free
📚 Education
(0)
19
Urban Dictionary
Urban Dictionary
Urban Dictionary
by Urban Dictionary LLC
Free

Access a vast collection of user-submitted definitions for slang and non-slang words. Search, vote on definitions, and discover new words with daily updates. Share interesting terms easily with friends.

Unlimited free searchesSlang and non-slang definitionsVote on definitions
🔍 Reference
(3.5K)
free
20
Thesaurus: Synonym Keyboard
Thesaurus: Synonym Keyboard
Thesaurus: Synonym Keyboard
Synonyms as you type
Free
📊 Productivity
(0)

FAQ about Synonym Dictionary Definitions Terms

What are the best synonym dictionary definitions terms apps for iPhone?
Dictionary.com: English Words tops our synonym dictionary definitions terms apps ranking as of August 2026, with a 4.8-star average from 328K App Store ratings, and it's free to download.
Yes — 20 of the top synonym dictionary definitions terms apps we rank are free to download, including Dictionary.com: English Words and Merriam-Webster Dictionary.
Dictionary.com: English Words shows ads and has no in-app purchases, according to its App Store listing as of August 2026.
We track 250+ synonym dictionary definitions terms apps on the iOS App Store as of August 2026, ranked by rating, recency, and analysis of real user reviews.
This app serves as a comprehensive English dictionary and thesaurus, offering over 2 million trusted definitions and synonyms. It aims to help users improve their English vocabulary, understanding, and writing skills through various features.
Key features include access to millions of definitions and synonyms, a 'Word of the Day' to expand vocabulary, example sentences to show word usage, audio pronunciations, grammar tips, and a search history to track learned words.