laborious vs punishing

laborious and punishing both are adjectives.

Word	Noun	Adjective	Verb	Adverb
laborious	No	Yes	No	No
punishing	No	Yes	No	No

As adjectives, laborious and punishing are synonyms defined as:

laborious and punishing: characterized by effort to the point of exhaustion; especially physical effort

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

laborious (adjective)	punishing (adjective)
characterized by effort to the point of exhaustion; especially physical effort	resulting in punishment
	characterized by effort to the point of exhaustion; especially physical effort