excruciating vs torturing

excruciating is not a noun while torturing is a noun.

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

As adjectives, excruciating and torturing are synonyms defined as:

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

excruciating (noun)	torturing (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

excruciating (adjective)	torturing (adjective)
extremely painful	extremely painful