bloodstain vs stain

bloodstain and stain both are nouns.

Word	Noun	Adjective	Verb	Adverb
bloodstain	Yes	No	No	No
stain	Yes	No	Yes	No

As nouns, stain is a hypernym of bloodstain; that is, stain is a word with a broader meaning than bloodstain:

Other hypernyms of bloodstain include discoloration, discolouration.

bloodstain (noun)	stain (noun)
a discoloration caused by blood	an act that brings discredit to the person who does it
	a soiled or discolored appearance
	a symbol of disgrace or infamy
	anything regarded as making something unclean
	(microscopy) a dye or other coloring material that is used in microscopy to make structures visible

bloodstain (verb)	stain (verb)
	produce or leave stains
	color with a liquid dye or tint
	color for microscopic study
	make dirty or spotty, as by exposure to air; also used metaphorically