stain vs tarnish

stain and tarnish both are nouns.

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

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

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

As verbs, stain and tarnish are synonyms defined as:

stain and tarnish: make dirty or spotty, as by exposure to air; also used metaphorically

Other synonyms of stain include defile, maculate, sully.

stain (noun)	tarnish (noun)
an act that brings discredit to the person who does it	discoloration of metal surface caused by oxidation
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)	tarnish (verb)
produce or leave stains	make dirty or spotty, as by exposure to air; also used metaphorically
color with a liquid dye or tint
color for microscopic study
make dirty or spotty, as by exposure to air; also used metaphorically