overkill vs capableness

overkill and capableness both are nouns.

Word	Noun	Adjective	Verb	Adverb
overkill	Yes	No	No	No
capableness	Yes	No	No	No

As nouns, capableness is a hypernym of overkill; that is, capableness is a word with a broader meaning than overkill:

overkill: the capability to obliterate a target with more weapons (especially nuclear weapons) than are required
capableness: the quality of being capable -- physically or intellectually or legally

Other hypernyms of overkill include capability.

overkill (noun)	capableness (noun)
any effort that seems to go farther than would be necessary to achieve its goal	the quality of being capable -- physically or intellectually or legally
the capability to obliterate a target with more weapons (especially nuclear weapons) than are required	an aptitude that may be developed