Is YESTERDAY a valid Scrabble word?

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

What YESTERDAY means

• noun - The day immediately before today; one day ago.
• adverb - On the day before today.

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.