Yes, PROSODIC is a Scrabble word!

Letter values in Scrabble US: P 3, R 1, O 1, S 1, O 1, D 2, I 1, C 3.

Is it a valid word?

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

of or relating to the rhythmic aspect of language or to the suprasegmental phonemes of pitch and stress and juncture and nasalization and voicing