Yes, COCHLEAE is a Scrabble word!

Letter values in Scrabble US: C 3, O 1, C 3, H 4, L 1, E 1, A 1, E 1.

Is it a valid word?

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

the snail-shaped tube (in the inner ear coiled around the modiolus) where sound vibrations are converted into nerve impulses by the organ of Corti