mock sun vs parhelion

mock sun and parhelion both are nouns.

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

As nouns, mock sun and parhelion are synonyms defined as:

mock sun and parhelion: a bright spot on the parhelic circle; caused by diffraction by ice crystals

Other synonyms of mock sun include sundog.

mock sun (noun)	parhelion (noun)
a bright spot on the parhelic circle; caused by diffraction by ice crystals	a bright spot on the parhelic circle; caused by diffraction by ice crystals