Yes, MOSAICS is a Scrabble word!

Letter values in Scrabble US: M 3, O 1, S 1, A 1, I 1, C 3, S 1.

Is it a valid word?

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

art consisting of a design made of small pieces of colored stone or glass
viral disease in solanaceous plants (tomatoes, potatoes, tobacco) resulting in mottling and often shriveling of the leaves
a freeware browser
a pattern resembling a mosaic
transducer formed by the light-sensitive surface on a television camera tube
arrangement of aerial photographs forming a composite picture

Also: arial mosaic.