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Why are some words valid in Collins Scrabble but not NASPA?

By the VGRHQ Team Published
Why are some words valid in Collins Scrabble but not NASPA?

Some words are valid in Collins Scrabble but not the NASPA Word List because the two lexicons have different editorial scope and entries. “Collins vs NASPA word list” is a comparison of dictionaries, not a choice between correct and incorrect English. Before challenging a word, identify the exact lexicon and edition selected for your game or tournament.

The comparison that actually matters

ReferenceWhat to check
Collins Scrabble Words, such as CSW24The international Scrabble lexicon and the event's adopted edition
NASPA Word List, such as NWL2023The North American tournament lexicon and the event's adopted edition
Official Scrabble Players DictionaryA separate dictionary often used for home and school play; not a synonym for every tournament list
An app's dictionary optionThe actual selected language and lexicon, not only the app's location setting

NASPA's published history says NWL2023 took effect on February 29, 2024. Its tournament ecosystem also includes Collins events. Calling every NASPA event “American dictionary only” therefore confuses the organizer with the lexicon. Read the event rules, which should resolve the choice before play starts.

A small verified example set

NASPA's CSW24 comparison sheet identifies CH, EA, and EE as two-letter entries accepted in CSW24 but not NWL2023. These examples are useful precisely because the editions are named. They are not a promise about every historical Collins list, every future update, or a different word game's dictionary.

The same comparison warns against treating Collins as simply “NWL plus extra words.” Its relationship to NWL2023 includes omissions as well as additions. Do not use a combined unofficial master list unless your game explicitly allows it: accepting every entry from both references creates a third rule set.

For a disputed play, look up the exact spelling. A familiar abbreviation, proper name, or dictionary headword is not automatically a valid Scrabble entry. Our separate answers for IQ in Scrabble and OK in Scrabble cover those specific questions without turning this comparison into another competing word-validity page.

Why two respectable lists can disagree

A general dictionary describes language; a game lexicon determines legal plays under a chosen ruleset. Editorial sources, regional vocabulary, inflected forms, length coverage, and policies about sensitive entries can differ. Release dates also matter: a word added in one edition may still be absent from the older edition installed in your study software.

A disagreement is therefore not proof that an opponent invented a word or that your app is broken. First check whether both lookups used the same list. Next check the edition. Only then investigate spelling, inflection, or an actual database discrepancy.

Set up your checker and study routine

  1. Write down the event's full lexicon name and edition.
  2. Set both the word checker and your study software to that reference.
  3. Use a small difference list when switching formats, rather than relearning every shared word.
  4. Agree on the challenge procedure before a casual game; do not change dictionaries midway through it.

If you are studying two formats, label your decks clearly. An entry marked “CSW only” is a reminder about legality, not a recommendation to play it in an NWL event. Do not infer definitions from a difference sheet either: it establishes membership, while a suitable dictionary supplies the meaning.

The practical answer is simple: neither opponent's preferred reference wins a dispute by default. The agreed tournament or house rules determine the applicable list, and its named edition determines the lookup.

Sources and verification

Sources checked October 7, 2026.

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