Yes, VEGETATION is a Scrabble word!

Letter values in Scrabble US: V 4, E 1, G 2, E 1, T 1, A 1, T 1, I 1, O 1, N 1.

Is it a valid word?

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

all the plant life in a particular region or period
the process of growth in plants
an abnormal growth or excrescence (especially a warty excrescence on the valves of the heart)
inactivity that is passive and monotonous, comparable to the inactivity of plant life