Yes, GLADS is a Scrabble word!

Letter values in Scrabble US: G 2, L 1, A 1, D 2, S 1.

Is it a valid word?

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

any of numerous plants of the genus Gladiolus native chiefly to tropical and South Africa having sword-shaped leaves and one-sided spikes of brightly colored funnel-shaped flowers; widely cultivated

Also: sword lily.