stain vs stainer

stain and stainer both are nouns.

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

stain (noun)	stainer (noun)
an act that brings discredit to the person who does it	a worker who stains (wood or fabric)
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)	stainer (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