Official Scrabble Dictionary Guide
Every valid Scrabble word exists because a committee decided it belongs. The dictionaries behind competitive Scrabble are carefully curated, regularly updated, and governed by organisations with specific mandates. Whether you're settling a family argument or preparing for a tournament, knowing which dictionary applies â and what it contains â is the first step to playing with confidence.
The Major Scrabble Dictionaries Explained
There isn't one single Scrabble dictionary â there are several, each serving a different purpose and audience. Here's a breakdown of every official word list you'll encounter:
| Dictionary | Full Name | Purpose | Region |
|---|---|---|---|
| OSPD | Official Scrabble Players Dictionary | Home & school play | North America |
| TWL/NWL | NASPA Word List | Tournament & club play | North America |
| SOWPODS/CSW | Collins Scrabble Words | All international play | Worldwide (outside NA) |
| OSW | Official Scrabble Words | Historical (now merged into CSW) | UK (discontinued) |
đĄ OSPD vs TWL â What's the Difference?
OSPD is the family-friendly version â it removes offensive words and includes definitions. TWL/NWL is the tournament version â it includes all valid words (even offensive ones) but has no definitions. Same word list minus the censorship. Tournament players always use TWL/NWL.
Who Maintains the Dictionaries
Two primary organisations control what words are legal in competitive Scrabble. Their decisions affect every tournament player worldwide.
â NASPA â North America
The North American Scrabble Players Association maintains the NWL (formerly TWL). Their Dictionary Committee reviews word submissions, consults lexicographic sources, and publishes updates every few years. NASPA also sanctions tournaments and manages player ratings in the US and Canada.
â WESPA + Collins â International
The World English-Language Scrabble Players Association (WESPA) partners with Collins Dictionary to publish CSW. Collins's lexicographers review corpus data from books, newspapers, and digital media to identify words with sufficient usage to warrant inclusion. WESPA governs international tournament rules.
NASPA
Governs NA play
WESPA
Governs international
Collins
Publishes CSW
Hasbro
Owns Scrabble (NA)
How Words Get Added to the Dictionary
New words don't appear in the Scrabble dictionary overnight. The process is rigorous, evidence-based, and deliberately slow to maintain the integrity of competitive play. Here's how a word goes from everyday use to legal Scrabble play:
𧊠The Word Approval Process
Corpus evidence: The word must appear in published sources (books, newspapers, magazines, academic papers) with sufficient frequency and across multiple independent sources.
Committee review: Lexicographers and committee members evaluate whether the word meets criteria â it must not be a proper noun, abbreviation, or require a hyphen or apostrophe.
Inflection check: Valid inflected forms (plurals, verb conjugations, comparatives) are also added. If EMOJI is approved, EMOJIS follows automatically.
Publication: Approved words appear in the next edition of the dictionary. Players are given advance notice (usually months) before new words become tournament-legal.
â Gets Approved
Common nouns, verbs, adjectives, and adverbs with published evidence. Words from any English dialect (British, American, Australian, Indian, South African) as long as they appear in print sources independently.
â Gets Rejected
Proper nouns (London, Nike), abbreviations (LOL, ASAP), hyphenated words (well-known), words requiring apostrophes (it's, don't), and words without sufficient published evidence of standalone usage.
Digital vs Physical Dictionaries
The way players access word lists has evolved dramatically. While physical books still exist, digital tools have become the primary reference for serious players.
đ Physical Editions
OSPD6 (Merriam-Webster, 2014) is the latest print edition for home play. Collins Scrabble Words is available in print but at 700+ pages it's impractical for quick reference. Physical books are useful for study but never used during tournament play.
đģ Digital Tools
Online word checkers (like ours), Zyzzyva (free study software), word list apps, and anagramming tools. Digital versions are always up-to-date and allow pattern searching, hook finding, and probability calculations impossible with print.
đĄ During Tournament Play
Players cannot consult any reference during their games. Dictionaries are only used to adjudicate challenges â when one player challenges another's word, the tournament director checks the official digital word list. Between rounds, players can study freely.
Tips for Using Official Dictionaries
Always check your dictionary version: If you're studying for a tournament in 2026, make sure your word checker uses NWL2023 or CSW2021 (the current editions). Older versions may be missing hundreds of recently added words.
Study the hooks, not just the words: A hook is a letter you can add to an existing word to make a new word. Knowing that EMOJI hooks to EMOJIS, or that QOPH can be extended to QOPHS, multiplies your scoring options beyond just knowing the base words.
Words With Friends is NOT official Scrabble: WWF uses a proprietary dictionary that's different from both TWL and SOWPODS. Words valid in WWF may not be valid in Scrabble, and vice versa. Don't mix your word knowledge between the two games.
Focus on high-value edge cases: The words that win tournaments are often obscure but short â two and three-letter words, Q-without-U words, and words with J, X, Z. These appear in every game and many players don't know them all.
Use our free Word Finder to verify: Before committing a word to your tournament vocabulary, check it against the correct dictionary. Our tool validates words against both TWL and SOWPODS instantly â no signup required, no guesswork involved.
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