colonist vs migrator

colonist and migrator both are nouns.

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

As nouns, migrator is a hypernym of colonist; that is, migrator is a word with a broader meaning than colonist:

Other hypernyms of colonist include migrant.

colonist (noun)	migrator (noun)
a person who settles in a new colony or moves into new country	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