fleck vs mock sun

fleck and mock sun both are nouns.

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

As nouns, mock sun is a hyponym of fleck; that is, mock sun is a word with a more specific, narrower meaning than fleck:

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

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

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