Yes, ANNUALS is a Scrabble word!

Letter values in Scrabble US: A 1, N 1, N 1, U 1, A 1, L 1, S 1.

Is it a valid word?

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

(botany) a plant that completes its entire life cycle within the space of a year
a reference book that is published regularly once every year