eccentricity vs eccentric

eccentricity and eccentric both are nouns.

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

eccentricity (noun)	eccentric (noun)
strange and unconventional behavior	a person with an unusual or odd personality
a circularity that has a different center or deviates from a circular path	a person of a specified kind (usually with many eccentricities)
(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

eccentricity (adjective)	eccentric (adjective)
	not having a common center; not concentric
	conspicuously or grossly unconventional or unusual