Yes, VIBRATE is a Scrabble word!

Letter values in Scrabble US: V 4, I 1, B 3, R 1, A 1, T 1, E 1.

Is it a valid word?

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

shake, quiver, or throb; move back and forth rapidly, usually in an uncontrolled manner
move or swing from side to side regularly
be undecided about something; waver between conflicting positions or courses of action
sound with resonance
feel sudden intense sensation or emotion