Yes, PONS is a Scrabble word!

Letter values in Scrabble US: P 3, O 1, N 1, S 1.

Is it a valid word?

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

United States coloratura soprano (born in France) (1904-1976)
a band of nerve fibers linking the medulla oblongata and the cerebellum with the midbrain

Also: lily pons, alice-josephine pons, pons varolii.