migrate vs migrator

migrate is not a noun while migrator is a noun.

Word	Noun	Adjective	Verb	Adverb
migrate	No	No	Yes	No
migrator	Yes	No	No	No

migrate (noun)	migrator (noun)
	an animal (especially birds and fish) that travels between different habitats at particular times of the year
	traveler who moves from one region or country to another

migrate (verb)	migrator (verb)
move from one country or region to another and settle there
move periodically or seasonally