executability vs capability

executability and capability both are nouns.

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

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

executability: capability of being executed
capability: the quality of being capable -- physically or intellectually or legally

Other hypernyms of executability include capableness.

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