rucksack vs haversack

rucksack and haversack both are nouns.

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

As nouns, rucksack and haversack are synonyms defined as:

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

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

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