stain vs bloodstain

stain and bloodstain both are nouns.

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

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

Other hyponyms of stain include scorch, iron mold, iron mould, mud stain, oil stain, tarnish.

stain (noun)	bloodstain (noun)
an act that brings discredit to the person who does it	a discoloration caused by blood
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

stain (verb)	bloodstain (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