simulation vs simulate

simulation is a noun but simulate is not a noun.

Word	Noun	Adjective	Verb	Adverb
simulation	Yes	No	No	No
simulate	No	No	Yes	No

simulation (noun)	simulate (noun)
the act of giving a false appearance
the act of imitating the behavior of some situation or some process by means of something suitably analogous (especially for the purpose of study or personnel training)
representation of something (sometimes on a smaller scale)
(computer science) the technique of representing the real world by a computer program

simulation (verb)	simulate (verb)
	make a pretence of
	create a representation or simulation of
	reproduce someone's behavior or looks