Yes, ANT is a Scrabble word!

Letter values in Scrabble US: A 1, N 1, T 1.

Is it a valid word?

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

social insect living in organized colonies; characteristically the males and fertile queen have wings during breeding season; wingless sterile females are the workers