Yes, ASTER is a Scrabble word!

Letter values in Scrabble US: A 1, S 1, T 1, E 1, R 1.

Is it a valid word?

ASTER is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

any of various chiefly fall-blooming herbs of the genus Aster with showy daisylike flowers
star-shaped structure formed in the cytoplasm of a cell having fibers like rays that surround the centrosome during mitosis

ASTER was the Wordle answer on Sept. 11, 2026 (#1,910). Stuck on today’s? Use the Wordle helper.