carnage vs bloodletting

carnage and bloodletting both are nouns.

Word	Noun	Adjective	Verb	Adverb
carnage	Yes	No	No	No
bloodletting	Yes	No	No	No

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

Other hyponyms of carnage include battue, bloodbath, bloodshed.

carnage (noun)	bloodletting (noun)
the savage and excessive killing of many people	formerly used as a treatment to reduce excess blood (one of the four humors of medieval medicine)
	indiscriminate slaughter