Yes, PEACOCKS is a Scrabble word!

Letter values in Scrabble US: P 3, E 1, A 1, C 3, O 1, C 3, K 5, S 1.

Is it a valid word?

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

European butterfly having reddish-brown wings each marked with a purple eyespot
male peafowl; having a crested head and very large fanlike tail marked with iridescent eyes or spots

Also: peacock butterfly, inachis io.