mock sun vs speckle

mock sun and speckle both are nouns.

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

As nouns, speckle is a hypernym of mock sun; that is, speckle 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
speckle: a small contrasting part of something

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

mock sun (noun)	speckle (noun)
a bright spot on the parhelic circle; caused by diffraction by ice crystals	a small contrasting part of something

mock sun (verb)	speckle (verb)
	mark with small spots
	produce a mottled effect