torturing vs agonising

torturing is a noun but agonising is not a noun.

Word	Noun	Adjective	Verb	Adverb
torturing	Yes	Yes	No	No
agonising	No	Yes	No	No

As adjectives, torturing and agonising are synonyms defined as:

Other synonyms of torturing include agonizing, excruciating, harrowing, torturesome, torturous.

torturing (noun)	agonising (noun)
the deliberate, systematic, or wanton infliction of physical or mental suffering by one or more persons in an attempt to force another person to yield information or to make a confession or for any other reason

torturing (adjective)	agonising (adjective)
extremely painful	extremely painful