Yes, squash is a Scrabble word!

Verb

1. To compress with violence, out of natural shape or condition

Noun

1. Any of numerous annual trailing plants of the genus Cucurbita grown for their fleshy edible fruits

2. Edible fruit of a squash plant; eaten as a vegetable

3. A game played in an enclosed court by two or four players who strike the ball with long-handled rackets