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Best Synonym Dictionary Definitions Terms Apps

250+ iOS apps curated and reviewed

4.3 avg rating
18 free apps
Updated October 2026

The best synonym dictionary definitions terms apps on iPhone average 4.3★ across 250+ titles — we've ranked them by what real users actually keep on their phones. Updated October 2026.

Compare top Synonym Dictionary Definitions Terms Apps (October 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Merriam-Webster DictionaryMerriam-Webster DictionaryFree4.8★ (330K)YesYesOct 2026
2Dictionary.com: English WordsDictionary.com: English WordsFree4.8★ (328K)YesNoOct 2026
3Synonym Dictionary Definitions TermsSynonym Dictionary Definitions TermsFree1.7★ (6)NoNoMay 2026
4Dictionary.Dictionary.Free4.8★ (15K)YesYesOct 2026
5Power ThesaurusPower ThesaurusFree4.8★ (3.1K)YesYesOct 2026
6Etymonline English DictionaryEtymonline English DictionaryFree4.9★ (12K)YesYesOct 2026
7Synonyms DictionarySynonyms DictionaryFree—NoNoMay 2026
8Dictionary Plus PlusDictionary Plus PlusFree—YesYesAug 2026

Top Picks for Synonym Dictionary Definitions Terms

Merriam-Webster Dictionary#1

Merriam-Webster Dictionary by Merriam-Webster, Inc.

Editor's Choice
🔍 Reference
4.8😊(330K ratings)
FreeAdsIn-App Purchases
#51in 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
  • 👍 Word of the day feature
  • 👍 Fun word games

Room to Improve

  • 🐛 Ads can be intrusive
  • 🐛 Difficulty closing ads
  • 🐛 Repetitive game questions
  • 🐛 Missing words in dictionary
  • 🐛 Unreasonable level progression in games
Dictionary.com: English Words#2

Dictionary.com: English Words by Curiosity Media

Dictionary, Thesaurus, Vocab
Strong Contender
🔍 Reference
4.8😐(328K ratings)
FreeAdsIn-App Purchases
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
  • 🤩 Great for expanding vocabulary

Room to Improve

  • 🐛 Inconsistent search results and missing definitions
  • 💸 Aggressive ads even after paid upgrades
  • 🤯 Frequent crashes and performance issues
  • 🤔 Confusing layout changes and UI issues
  • 🤷‍♀️ Paid features not always working as expected

More Synonym Dictionary Definitions Terms apps to explore

FAQ about Synonym Dictionary Definitions Terms

What are the best synonym dictionary definitions terms apps for iPhone?
Merriam-Webster Dictionary tops our synonym dictionary definitions terms apps ranking as of October 2026, with a 4.8-star average from 330K App Store ratings, and it's free to download.
Yes — 18 of the top synonym dictionary definitions terms apps we rank are free to download, including Merriam-Webster Dictionary and Dictionary.com: English Words.
Merriam-Webster Dictionary shows ads and offers in-app purchases, according to its App Store listing as of October 2026.
We track 250+ synonym dictionary definitions terms apps on the iOS App Store as of October 2026, ranked by rating, recency, and analysis of real user reviews.