Yes, TREAT is a Scrabble word!

Letter values in Scrabble US: T 1, R 1, E 1, A 1, T 1.

Is it a valid word?

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

interact in a certain way
subject to a process or treatment, with the aim of readying for some purpose, improving, or remedying a condition
provide treatment for
act on verbally or in some form of artistic expression
provide with a gift or entertainment
provide with choice or abundant food or drink
engage in negotiations in order to reach an agreement
regard or consider in a specific way

TREAT was the Wordle answer on Aug. 20, 2022 (#427). Stuck on today’s? Use the Wordle helper.

Also: do by, care for.