Yes, ASSOCIATIVE is a Scrabble word!

Letter values in Scrabble US: A 1, S 1, S 1, O 1, C 3, I 1, A 1, T 1, I 1, V 4, E 1.

Is it a valid word?

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

characterized by or causing or resulting from the process of bringing ideas or events together in memory or imagination

Not playable in Scrabble US: ASSOCIATORY.