halo vs solar halo

halo and solar halo both are nouns.

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

As nouns, solar halo is a hyponym of halo; that is, solar halo is a word with a more specific, narrower meaning than halo:

halo: a circle of light around the sun or moon
solar halo: a luminous halo parallel to the horizon at the altitude of the sun; caused by ice crystals in the atmosphere

Other hyponyms of halo include parhelic circle, parhelic ring.

halo (noun)	solar halo (noun)
an indication of radiant light drawn around the head of a saint	a luminous halo parallel to the horizon at the altitude of the sun; caused by ice crystals in the atmosphere
a circle of light around the sun or moon
a toroidal shape