immigrate vs immigration

immigrate is not a noun while immigration is a noun.

Word	Noun	Adjective	Verb	Adverb
immigrate	No	No	Yes	No
immigration	Yes	No	No	No

immigrate (noun)	immigration (noun)
	migration into a place (especially migration to a country of which you are not a native in order to settle there)
	the body of immigrants arriving during a specified interval

immigrate (verb)	immigration (verb)
come into a new country and change residency
migrate to a new environment
introduce or send as immigrants