Scrabble
Acceptable words

All words of length 2 to 15 letters that appear in the agreed-upon dictionary or lexicon are acceptable words in Scrabble, as are all their inflected forms and plurals. Words that contain apostrophes, are hyphenated or capitalized (such as proper nouns) are generally not allowed unless they also appear as acceptable entries; for example, words such as HERES, JACK and TEXAS, while typically containing an apostrophe or considered a proper noun, have unrelated meanings and are therefore acceptable in major Scrabble lexicons. Acronyms and abbreviations are generally not allowed unless they have separate entries (such as AWOL, RADAR, SCUBA, and WYSIWYG). Variant spellings, slang or offensive terms, archaic or obsolete terms, and specialized jargon words are acceptable if they meet all other criteria for acceptability, but archaic spellings (e.g., NEEDE or MAKETH) are generally not acceptable words. Foreign words are not allowed in English-language Scrabble unless they have been incorporated into the English language, such as the words QI, KILIM, and PATISSERIE.

Vulgar and offensive words are generally excluded from the Official Scrabble Players Dictionary but allowed in club and tournament play. The North American Scrabble Players Association removed slurs from its lexicon in 2020, after conducting a poll of its members. Mattel removed 400 derogatory terms from its official word list in 2021, in response to the Black Lives Matter movement, with the company's head of games saying: "Can you imagine any other game where you can score points and win by using a racial epithet? It’s long overdue." This does not exclude players from playing these words, as it is within the rules of the game to play unacceptable words (at the risk of losing a challenge).

There are two popular competition word lists for English-language Scrabble:

The first predominates in the U.S., Canada, Thailand, and the second in English Scrabble in the rest of the world. There is also a large community of competitive Collins players in North America, with its own NASPA rating system.
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