haversack vs rucksack

haversack and rucksack both are nouns.

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

As nouns, haversack and rucksack are synonyms defined as:

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

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

haversack (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