torus vs round shape

torus and round shape both are nouns.

Word	Noun	Adjective	Verb	Adverb
torus	Yes	No	No	No
round shape	Yes	No	No	No

As nouns, round shape is a hypernym of torus; that is, round shape is a word with a broader meaning than torus:

torus: a ring-shaped surface generated by rotating a circle around an axis that does not intersect the circle
round shape: a shape that is curved and without sharp angles

torus (noun)	round shape (noun)
commonly the lowest molding at the base of a column	a shape that is curved and without sharp angles
a ring-shaped surface generated by rotating a circle around an axis that does not intersect the circle