massacre vs bloodshed

massacre and bloodshed both are nouns.

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

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

Other hyponyms of massacre include battue, bloodbath, bloodletting.

massacre (noun)	bloodshed (noun)
the savage and excessive killing of many people	indiscriminate slaughter
	the shedding of blood resulting in murder

massacre (verb)	bloodshed (verb)
kill a large number of people indiscriminately