annulus vs toroid

annulus and toroid both are nouns.

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

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

annulus (noun)	toroid (noun)
(Fungi) a remnant of the partial veil that in mature mushrooms surrounds the stem like a collar	a ring-shaped surface generated by rotating a circle around an axis that does not intersect the circle
a toroidal shape	the doughnut-shaped object enclosed by a torus