mock sun vs fleck

mock sun and fleck both are nouns.

Word	Noun	Adjective	Verb	Adverb
mock sun	Yes	No	No	No
fleck	Yes	No	Yes	No

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

mock sun: a bright spot on the parhelic circle; caused by diffraction by ice crystals
fleck: a small contrasting part of something

Other hypernyms of mock sun include dapple, maculation, patch, speckle, spot.

mock sun (noun)	fleck (noun)
a bright spot on the parhelic circle; caused by diffraction by ice crystals	a small contrasting part of something
	a small fragment of something broken off from the whole

mock sun (verb)	fleck (verb)
	make a spot or mark onto