Yes, BASICS is a Scrabble word!

Letter values in Scrabble US: B 3, A 1, S 1, I 1, C 3, S 1.

Is it a valid word?

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

a statement of fundamental facts or principles
principles from which other truths can be derived
a popular programming language that is relatively easy to learn; an acronym for beginner's all-purpose symbolic instruction code; no longer in general use
(usually plural) a necessary commodity for which demand is constant

Also: fundamental principle, basic principle.