solar halo vs halo

solar halo and halo both are nouns.

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

As nouns, halo is a hypernym of solar halo; that is, halo is a word with a broader meaning than solar halo:

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

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