Yes, VECTORS is a Scrabble word!

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

Is it a valid word?

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

a variable quantity that can be resolved into components
a straight line segment whose length is magnitude and whose orientation in space is direction
any agent (person or animal or microorganism) that carries and transmits a disease
(genetics) a virus or other agent that is used to deliver DNA to a cell