migratory vs migrant

migratory is not a noun while migrant is a noun.

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

As adjectives, migratory and migrant are synonyms defined as:

migratory and migrant: habitually moving from place to place especially in search of seasonal work

migratory (noun)	migrant (noun)
	traveler who moves from one region or country to another

migratory (adjective)	migrant (adjective)
used of animals that move seasonally	habitually moving from place to place especially in search of seasonal work
habitually moving from place to place especially in search of seasonal work