Yes, TRACHEAE is a Scrabble word!

Letter values in Scrabble US: T 1, R 1, A 1, C 3, H 4, E 1, A 1, E 1.

Is it a valid word?

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

membranous tube with cartilaginous rings that conveys inhaled air from the larynx to the bronchi
one of the tubules forming the respiratory system of most insects and many arachnids