collimate vs collimator

collimate is not a noun while collimator is a noun.

Word	Noun	Adjective	Verb	Adverb
collimate	No	No	Yes	No
collimator	Yes	No	No	No

collimate (noun)	collimator (noun)
	optical device consisting of a tube containing a convex achromatic lens at one end and a slit at the other with the slit at the focus of the lens; light rays leave the slit as a parallel beam
	a small telescope attached to a large telescope to use in setting the line of the larger one

collimate (verb)	collimator (verb)
adjust the line of sight of (an optical instrument)
make or place parallel to something