Yes, CHOKERS is a Scrabble word!

Letter values in Scrabble US: C 3, H 4, O 1, K 5, E 1, R 1, S 1.

Is it a valid word?

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

someone who kills by strangling
an unfortunate person who is unable to perform effectively because of nervous tension or agitation
necklace that fits tightly around a woman's neck
a high tight collar

Also: dog collar, neck ruff.

Not playable in Scrabble US: GARROTTER.