How Scrabble Determines If a Word Is Playable

https://letterladder.birchreport.com/posts/how-scrabble-determines-if-a-word-is-playable

Scrabble uses the Official Scrabble Players Dictionary or the tournament word list to check if your word is playable. The game's rules also require the word to be formed from the tiles on your rack, connecting correctly to existing words on the board—no proper nouns, abbreviations, or hyphenated terms allowed.