parhelion vs fleck

parhelion and fleck both are nouns.

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

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

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

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

parhelion (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

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