fleck vs sully

fleck is a noun but sully is not a noun.

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

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

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

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

fleck (noun)	sully (noun)
a small contrasting part of something
a small fragment of something broken off from the whole

fleck (verb)	sully (verb)
make a spot or mark onto	charge falsely or with malicious intent; attack the good name and reputation of someone
	make dirty or spotty, as by exposure to air; also used metaphorically
	place under suspicion or cast doubt upon