bloodletting vs bloodshed

bloodletting and bloodshed both are nouns.

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

As nouns, bloodletting and bloodshed are synonyms defined as:

Other synonyms of bloodletting include battue, bloodbath.

bloodletting (noun)	bloodshed (noun)
formerly used as a treatment to reduce excess blood (one of the four humors of medieval medicine)	indiscriminate slaughter
indiscriminate slaughter	the shedding of blood resulting in murder