eccentricity vs circularity

eccentricity and circularity both are nouns.

Word	Noun	Adjective	Verb	Adverb
eccentricity	Yes	No	No	No
circularity	Yes	No	No	No

As nouns, circularity is a hypernym of eccentricity; that is, circularity is a word with a broader meaning than eccentricity:

eccentricity: a circularity that has a different center or deviates from a circular path
circularity: the roundness of a 2-dimensional figure

Other hypernyms of eccentricity include disk shape.

eccentricity (noun)	circularity (noun)
strange and unconventional behavior	the roundness of a 2-dimensional figure
a circularity that has a different center or deviates from a circular path
(geometry) a ratio describing the shape of a conic section; the ratio of the distance between the foci to the length of the major axis