migrator vs colonist

migrator and colonist both are nouns.

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

As nouns, colonist is a hyponym of migrator; that is, colonist is a word with a more specific, narrower meaning than migrator:

Other hyponyms of migrator include departer, goer, leaver, emigrant, emigre, emigree, outgoer, evacuee, immigrant, rusher, settler.

migrator (noun)	colonist (noun)
an animal (especially birds and fish) that travels between different habitats at particular times of the year	a person who settles in a new colony or moves into new country
traveler who moves from one region or country to another