Is NIGHTMARE a valid Scrabble word?

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

What NIGHTMARE means

• noun - A very unpleasant or frightening dream.
• verb - To experience a nightmare.

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.