Yes, VERBALIZER is a Scrabble word!

Letter values in Scrabble US: V 4, E 1, R 1, B 3, A 1, L 1, I 1, Z 10, E 1, R 1.

Is it a valid word?

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

someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)

Not playable in Scrabble US: VERBALISER.