parhelic ring vs solar halo

parhelic ring and solar halo both are nouns.

Word	Noun	Adjective	Verb	Adverb
parhelic ring	Yes	No	No	No
solar halo	Yes	No	No	No

As nouns, parhelic ring and solar halo are synonyms defined as:

parhelic ring and solar halo: a luminous halo parallel to the horizon at the altitude of the sun; caused by ice crystals in the atmosphere

Other synonyms of parhelic ring include parhelic circle.

parhelic ring (noun)	solar halo (noun)
a luminous halo parallel to the horizon at the altitude of the sun; caused by ice crystals in the atmosphere	a luminous halo parallel to the horizon at the altitude of the sun; caused by ice crystals in the atmosphere