fleck vs tarnish

fleck and tarnish both are nouns.

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

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

fleck: make a spot or mark onto
tarnish: make dirty or spotty, as by exposure to air; also used metaphorically

Other hyponyms of fleck include splotch, defile, maculate, stain, sully, bespeckle, speckle, bespatter, spatter.

fleck (noun)	tarnish (noun)
a small contrasting part of something	discoloration of metal surface caused by oxidation
a small fragment of something broken off from the whole

fleck (verb)	tarnish (verb)
make a spot or mark onto	make dirty or spotty, as by exposure to air; also used metaphorically