Yes, TERRENE is a Scrabble word!

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

Is it a valid word?

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

of or relating to or inhabiting the land as opposed to the sea or air
belonging to this earth or world; not ideal or heavenly; yet a mundane wonder of unimagined kind"