Yes, DEANS is a Scrabble word!

Letter values in Scrabble US: D 2, E 1, A 1, N 1, S 1.

Is it a valid word?

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

an administrator in charge of a division of a university or college
United States film actor whose moody rebellious roles made him a cult figure (1931-1955)
a man who is the senior member of a group
(Roman Catholic Church) the head of the College of Cardinals

Also: james dean, james byron dean.