perfectibility vs capability

perfectibility and capability both are nouns.

Word	Noun	Adjective	Verb	Adverb
perfectibility	Yes	No	No	No
capability	Yes	No	No	No

As nouns, capability is a hypernym of perfectibility; that is, capability is a word with a broader meaning than perfectibility:

Other hypernyms of perfectibility include capableness, potentiality.

perfectibility (noun)	capability (noun)
the capability of becoming perfect	the quality of being capable -- physically or intellectually or legally
	an aptitude that may be developed
	the susceptibility of something to a particular treatment