Yes, ALIGNMENTS is a Scrabble word!

Letter values in Scrabble US: A 1, L 1, I 1, G 2, N 1, M 3, E 1, N 1, T 1, S 1.

Is it a valid word?

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

an organization of people (or countries) involved in a pact or treaty
the spatial property possessed by an arrangement or position of things in a straight line or in parallel lines
(astronomy) apparent meeting or passing of two or more celestial bodies in the same degree of the zodiac
the act of adjusting or aligning the parts of a device in relation to each other