Yes, RESIDENCIES is a Scrabble word!

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

Is it a valid word?

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

the act of dwelling in a place
the position of physician who is receiving special training in a hospital (usually after completing an internship)