parhelion vs mock sun

parhelion and mock sun both are nouns.

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

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

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

Other synonyms of parhelion include sundog.

parhelion (noun)	mock sun (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