Yes, GENDERS is a Scrabble word!

Letter values in Scrabble US: G 2, E 1, N 1, D 2, E 1, R 1, S 1.

Is it a valid word?

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

a grammatical category in inflected languages governing the agreement between nouns and pronouns and adjectives; in some languages it is quite arbitrary but in Indo-European languages it is usually based on sex or animateness
the properties that distinguish organisms on the basis of their reproductive roles

Also: grammatical gender.