Is MISTRESS a valid Scrabble word?

Yes. MISTRESS is valid in Collins Scrabble Words 2024, the word list used for Scrabble in the UK.

What MISTRESS means

• noun - A woman, specifically one with great control, authority or ownership.
• verb - Of a woman: to master; to learn or develop to a high degree of proficiency.

Definitions come from Wiktionary via kaikki.org, shortened to fit, and are used under CC BY-SA 4.0.

Gramlet is a daily word game played with the same Collins list. Play today's board.