eccentric vs nutter

eccentric and nutter both are nouns.

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

As nouns, nutter is a hyponym of eccentric; that is, nutter is a word with a more specific, narrower meaning than eccentric:

Other hyponyms of eccentric include crackpot, crank, fruitcake, nut, nut case, screwball, wacko, whacko.

eccentric (noun)	nutter (noun)
a person with an unusual or odd personality	a person who is regarded as eccentric or mad
a person of a specified kind (usually with many eccentricities)

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