migrator vs beast

migrator and beast both are nouns.

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

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

migrator: an animal (especially birds and fish) that travels between different habitats at particular times of the year
beast: a living organism characterized by voluntary movement

Other hypernyms of migrator include animal, animate being, brute, creature, fauna.

migrator (noun)	beast (noun)
an animal (especially birds and fish) that travels between different habitats at particular times of the year	a living organism characterized by voluntary movement
traveler who moves from one region or country to another	a cruelly rapacious person