Yes, LIZARDS is a Scrabble word!

Letter values in Scrabble US: L 1, I 1, Z 10, A 1, R 1, D 2, S 1.

Is it a valid word?

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

relatively long-bodied reptile with usually two pairs of legs and a tapering tail
a man who idles about in the lounges of hotels and bars in search of women who would support him

Also: lounge lizard.