torture vs rack

torture and rack both are nouns.

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

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

torture: 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
rack: a form of torture in which pain is inflicted by stretching the body

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

Other hyponyms of torture include martyr, martyrise, martyrize.

As verbs, torture and rack are synonyms defined as:

Other synonyms of torture include excruciate, torment.

torture (noun)	rack (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	a rapid gait of a horse in which each foot strikes the ground separately
the act of distorting something so it seems to mean something it was not intended to mean	a form of torture in which pain is inflicted by stretching the body
intense feelings of suffering; acute mental or physical pain	a support for displaying ot holding various articles
extreme mental distress	an instrument of torture that stretches or disjoints or mutilates victims
unbearable physical pain	the destruction or collapse of something
	rib section of a forequarter of veal or pork or especially lamb or mutton

torture (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