bird of passage vs traveler

bird of passage and traveler both are nouns.

Word	Noun	Adjective	Verb	Adverb
bird of passage	Yes	No	No	No
traveler	Yes	No	No	No

As nouns, traveler is a hypernym of bird of passage; that is, traveler is a word with a broader meaning than bird of passage:

Other hypernyms of bird of passage include traveller.

bird of passage (noun)	traveler (noun)
any bird that migrates seasonally	a person who changes location
someone who leads a wandering unsettled life