Yes, AGUACATE is a Scrabble word!

Letter values in Scrabble US: A 1, G 2, U 1, A 1, C 3, A 1, T 1, E 1.

Is it a valid word?

AGUACATE is a valid word in the official Scrabble dictionary (US) and the UK Scrabble Dictionary, but not in Words with Friends (ENABLE).

a pear-shaped tropical fruit with green or blackish skin and rich yellowish pulp enclosing a single large seed

Also: alligator pear, avocado pear.