drifter vs rover

drifter and rover both are nouns.

Word	Noun	Adjective	Verb	Adverb
drifter	Yes	No	No	No
rover	Yes	No	No	No

As nouns, rover is a hypernym of drifter; that is, rover is a word with a broader meaning than drifter:

drifter: a wanderer who has no established residence or visible means of support
rover: someone who leads a wandering unsettled life

Other hypernyms of drifter include have-not, poor person, bird of passage, roamer, wanderer.

drifter (noun)	rover (noun)
a wanderer who has no established residence or visible means of support	someone who leads a wandering unsettled life
	an adult member of the Boy Scouts movement