eccentric vs wacko

eccentric and wacko both are nouns.

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

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

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

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