Yes, GUPPY is a Scrabble word!

Letter values in Scrabble US: G 2, U 1, P 3, P 3, Y 4.

Is it a valid word?

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

small freshwater fish of South America and the West Indies; often kept in aquariums

GUPPY was the Wordle answer on May 4, 2023 (#684). Stuck on today’s? Use the Wordle helper.

Also: rainbow fish, lebistes reticulatus.