Yes, LACEWINGS is a Scrabble word!

Letter values in Scrabble US: L 1, A 1, C 3, E 1, W 4, I 1, N 1, G 2, S 1.

Is it a valid word?

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

any of two families of insects with gauzy wings (Chrysopidae and Hemerobiidae); larvae feed on insect pests such as aphids

Also: lacewing fly.