sunspot vs fleck

sunspot and fleck both are nouns.

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

As nouns, fleck is a hypernym of sunspot; that is, fleck is a word with a broader meaning than sunspot:

sunspot: a cooler darker spot appearing periodically on the sun's photosphere; associated with a strong magnetic field
fleck: a small contrasting part of something

Other hypernyms of sunspot include dapple, maculation, patch, speckle, spot.

sunspot (noun)	fleck (noun)
a cooler darker spot appearing periodically on the sun's photosphere; associated with a strong magnetic field	a small contrasting part of something
	a small fragment of something broken off from the whole

sunspot (verb)	fleck (verb)
	make a spot or mark onto