bloodshed vs bloodletting

bloodshed and bloodletting both are nouns.

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

As nouns, bloodshed and bloodletting are synonyms defined as:

Other synonyms of bloodshed include battue, bloodbath.

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