Yes, ANTLIONS is a Scrabble word!

Letter values in Scrabble US: A 1, N 1, T 1, L 1, I 1, O 1, N 1, S 1.

Is it a valid word?

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

the larva of any of several insects
winged insect resembling a dragonfly; the larvae (doodlebugs) dig conical pits where they wait to catch e.g. ants

Also: ant lion, antlion fly.