infiltrate vs infiltrator

infiltrate is not a noun while infiltrator is a noun.

Word	Noun	Adjective	Verb	Adverb
infiltrate	No	No	Yes	No
infiltrator	Yes	No	No	No

infiltrate (noun)	infiltrator (noun)
	an intruder (as troops) with hostile intent
	someone who takes up a position surreptitiously for the purpose of espionage

infiltrate (verb)	infiltrator (verb)
pass through an enemy line; in a military conflict
cause (a liquid) to enter by penetrating the interstices
pass into or through by filtering or permeating
enter a group or organization in order to spy on the members