concentricity vs eccentricity

concentricity and eccentricity both are nouns.

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

concentricity (noun)	eccentricity (noun)
the quality of having the same center (as circles inside one another)	strange and unconventional behavior
	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