backpack vs rucksack

backpack and rucksack both are nouns.

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

As nouns, backpack and rucksack are synonyms defined as:

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

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

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

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