bloodbath vs bloodletting

bloodbath and bloodletting both are nouns.

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

As nouns, bloodbath and bloodletting are synonyms defined as:

Other synonyms of bloodbath include battue, bloodshed.

bloodbath (noun)	bloodletting (noun)
indiscriminate slaughter	formerly used as a treatment to reduce excess blood (one of the four humors of medieval medicine)
	indiscriminate slaughter