operose vs backbreaking

operose and backbreaking both are adjectives.

Word	Noun	Adjective	Verb	Adverb
operose	No	Yes	No	No
backbreaking	No	Yes	No	No

As adjectives, operose and backbreaking are synonyms defined as:

operose and backbreaking: characterized by effort to the point of exhaustion; especially physical effort

Other synonyms of operose include arduous, grueling, gruelling, hard, heavy, laborious, punishing, toilsome.

operose (adjective)	backbreaking (adjective)
characterized by effort to the point of exhaustion; especially physical effort	characterized by effort to the point of exhaustion; especially physical effort