parhelion vs sundog

parhelion and sundog both are nouns.

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

As nouns, parhelion and sundog are synonyms defined as:

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

Other synonyms of parhelion include mock sun.

parhelion (noun)	sundog (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