excruciate vs rack

excruciate is not a noun while rack is a noun.

Word	Noun	Adjective	Verb	Adverb
excruciate	No	No	Yes	No
rack	Yes	No	Yes	No

As verbs, rack is a hyponym of excruciate; that is, rack is a word with a more specific, narrower meaning than excruciate:

Other hyponyms of excruciate include martyr, martyrise, martyrize.

As verbs, excruciate and rack are synonyms defined as:

Other synonyms of excruciate include torment, torture.

excruciate (noun)	rack (noun)
	a rapid gait of a horse in which each foot strikes the ground separately
	a form of torture in which pain is inflicted by stretching the body
	a support for displaying ot holding various articles
	an instrument of torture that stretches or disjoints or mutilates victims
	the destruction or collapse of something
	rib section of a forequarter of veal or pork or especially lamb or mutton

excruciate (verb)	rack (verb)
subject to torture	torture on the rack
torment emotionally or mentally	seize together, as of parallel ropes of a tackle in order to prevent running through the block
	place in a rack
	work on a rack
	stretch to the limits
	torment emotionally or mentally
	go at a rack
	draw off from the lees
	run before a gale
	fly in high wind
	obtain by coercion or intimidation
	put on a rack and pinion