unconventional vs eccentric

unconventional is not a noun while eccentric is a noun.

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

unconventional (noun)	eccentric (noun)
	a person with an unusual or odd personality
	a person of a specified kind (usually with many eccentricities)

unconventional (adjective)	eccentric (adjective)
not conforming to accepted rules or standards	not having a common center; not concentric
not conventional or conformist	conspicuously or grossly unconventional or unusual
not conforming to legality, moral law, or social convention