crackpot vs eccentric

crackpot and eccentric both are nouns.

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

As nouns, eccentric is a hypernym of crackpot; that is, eccentric is a word with a broader meaning than crackpot:

Other hypernyms of crackpot include eccentric person, flake, geek, oddball.

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

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