This dictionary is for word games that are similar to Boggle, with 16 letters on board. So it doesn't have any words longer than 16 letters. Word count: 74,405.
Most other word games like Scrabble are ruined by allowing obsolete / foreign / abbreviated words. Native english speakers don't use these words outside of word games. But if you know them for word games, you just win. Examples:
Everyone knows them but they aren't words: FBI, RBI, ER. They would be fun to use, but if they were allowed you could just play any 3 letters because almost every combination of 3 letters is an abbreviation for something.
❎ No names of places: ENGLAND, HOLLYWOOD, NILE.
❎ No names of people: PLATO, MARY, JACKSON.
❎ No names of products: PEPSI, GOOGLE, BANDAID.
If every foreign food was a word, the game would have millions of words.
❎ NIGIRI, CONGEE, DOSA.
In general, if an abbreviation is more common than the original word, it should be included:
✅ PHOTO (short for PHOTOGRAPH)
✅ FRIDGE (short for REFRIGERATOR)
❎ DOC (short for DOCTOR)
❎ ALT (short for ALTERNATE)
Slang just means not common and only used by certain cool people.
Most slang words are also abbreviations, so they might not be included even if they became mainstream:
❎ DISS (short for DISRESPECT)
❎ SUS (short for SUSPICIOUS)
Not common enough to be included in a word game:
❎ FINK
❎ HANGRY
❎ THEE
❎ YARE
❎ ELD
❎ YOU'D
❎ SHOULDN'T'VE
❎ X-RAY
❎ T-SHIRT