halo vs toroid

halo and toroid both are nouns.

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

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

halo (noun)	toroid (noun)
an indication of radiant light drawn around the head of a saint	a ring-shaped surface generated by rotating a circle around an axis that does not intersect the circle
a circle of light around the sun or moon	the doughnut-shaped object enclosed by a torus
a toroidal shape