rucksack vs backpack

rucksack and backpack both are nouns.

Word	Noun	Adjective	Verb	Adverb
rucksack	Yes	No	No	No
backpack	Yes	No	Yes	No

As nouns, rucksack and backpack are synonyms defined as:

rucksack and backpack: a bag carried by a strap on your back or shoulder

Other synonyms of rucksack include back pack, haversack, knapsack, packsack.

rucksack (noun)	backpack (noun)
a bag carried by a strap on your back or shoulder	a bag carried by a strap on your back or shoulder

rucksack (verb)	backpack (verb)
	hike with a backpack