tramp vs backpacker

tramp and backpacker both are nouns.

Word	Noun	Adjective	Verb	Adverb
tramp	Yes	No	Yes	No
backpacker	Yes	No	No	No

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

Other hyponyms of tramp include packer.

tramp (noun)	backpacker (noun)
a long walk usually for exercise or pleasure	a hiker who wears a backpack
a commercial steamer for hire; one having no regular schedule
a heavy footfall
a vagrant
a person who engages freely in promiscuous sex
a foot traveler; someone who goes on an extended walk (for pleasure)

tramp (verb)	backpacker (verb)
travel on foot, especially on a walking expedition
walk heavily and firmly, as when weary, or through mud
move about aimlessly or without any destination, often in search of food or employment
cross on foot