echinus vs ovolo

echinus and ovolo both are nouns.

Word	Noun	Adjective	Verb	Adverb
echinus	Yes	No	No	No
ovolo	Yes	No	No	No

As nouns, ovolo is a hypernym of echinus; that is, ovolo is a word with a broader meaning than echinus:

echinus: ovolo molding between the shaft and the abacus of a Doric column
ovolo: a convex molding having a cross section in the form of a quarter of a circle or of an ellipse

Other hypernyms of echinus include quarter round, thumb.

echinus (noun)	ovolo (noun)
ovolo molding between the shaft and the abacus of a Doric column	a convex molding having a cross section in the form of a quarter of a circle or of an ellipse