migrant vs leaver

migrant and leaver both are nouns.

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

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

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

migrant (noun)	leaver (noun)
traveler who moves from one region or country to another	someone who leaves

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