stain vs staining

stain and staining both are nouns.

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

stain (noun)	staining (noun)
an act that brings discredit to the person who does it	(histology) the use of a dye to color specimens for microscopic study
a soiled or discolored appearance	the act of spotting or staining something
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)	staining (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