Yes, BASILS is a Scrabble word!

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

Is it a valid word?

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

any of several Old World tropical aromatic annual or perennial herbs of the genus Ocimum
(Roman Catholic Church) the bishop of Caesarea who defended the Roman Catholic Church against the heresies of the 4th century; a saint and Doctor of the Church (329-379)
leaves of the common basil; used fresh or dried

Also: st. basil, basil of caesarea, basil the great, st. basil the great, sweet basil.