immigrant vs migrant

immigrant and migrant both are nouns.

Word	Noun	Adjective	Verb	Adverb
immigrant	Yes	No	No	No
migrant	Yes	Yes	No	No

As nouns, migrant is a hypernym of immigrant; that is, migrant is a word with a broader meaning than immigrant:

immigrant: a person who comes to a country where they were not born in order to settle there
migrant: traveler who moves from one region or country to another

Other hypernyms of immigrant include migrator.

immigrant (noun)	migrant (noun)
a person who comes to a country where they were not born in order to settle there	traveler who moves from one region or country to another

immigrant (adjective)	migrant (adjective)
	habitually moving from place to place especially in search of seasonal work