Yes, ASSOCIATIONS 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, O 1, N 1, S 1.

Is it a valid word?

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

a formal organization of people or groups of people
the act of consorting with or joining with others
the state of being connected together as in memory or imagination
the process of bringing ideas or events together in memory or imagination
a social or business relationship
a relation resulting from interaction or dependence
(chemistry) any process of combination (especially in solution) that depends on relatively weak chemical bonding
(ecology) a group of organisms (plants and animals) that live together in a certain geographical region and constitute a community with a few dominant species

Also: tie-up.