fatality vs killing

fatality and killing both are nouns.

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

As nouns, killing is a hyponym of fatality; that is, killing is a word with a more specific, narrower meaning than fatality:

Other hyponyms of fatality include violent death, casualty, fatal accident.

fatality (noun)	killing (noun)
the quality of being able to cause death or fatal disasters	the act of terminating a life
a death resulting from an accident or a disaster	an event that causes someone to die
	a very large profit

fatality (adjective)	killing (adjective)
	very funny