integrator vs integrate

integrator is a noun but integrate is not a noun.

Word	Noun	Adjective	Verb	Adverb
integrator	Yes	No	No	No
integrate	No	No	Yes	No

integrator (noun)	integrate (noun)
a measuring instrument for measuring the area of an irregular plane figure

integrator (verb)	integrate (verb)
	make into a whole or make part of a whole
	become one; become integrated
	calculate the integral of; calculate by integration
	open (a place) to members of all races and ethnic groups