immigration vs immigrate

immigration is a noun but immigrate is not a noun.

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

immigration (noun)	immigrate (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

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