migrator vs migrate

migrator is a noun but migrate is not a noun.

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

migrator (noun)	migrate (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

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