Yes, WHITEHEADS is a Scrabble word!

Letter values in Scrabble US: W 4, H 4, I 1, T 1, E 1, H 4, E 1, A 1, D 2, S 1.

Is it a valid word?

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

English philosopher and mathematician who collaborated with Bertrand Russell (1861-1947)
a small whitish lump in the skin due to a clogged sebaceous gland

Also: alfred north whitehead.