killing vs termination

killing and termination both are nouns.

Word	Noun	Adjective	Verb	Adverb
killing	Yes	Yes	No	No
termination	Yes	No	No	No

As nouns, termination is a hypernym of killing; that is, termination is a word with a broader meaning than killing:

Other hypernyms of killing include conclusion, ending.

killing (noun)	termination (noun)
the act of terminating a life	the act of ending something
an event that causes someone to die	the end of a word (a suffix or inflectional ending or final morpheme)
a very large profit	something that results
	a place where something ends or is complete
	a coming to an end of a contract period

killing (adjective)	termination (adjective)
very funny