net profit vs killing

net profit and killing both are nouns.

Word	Noun	Adjective	Verb	Adverb
net profit	Yes	No	No	No
killing	Yes	Yes	No	No

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

net profit: the excess of revenues over outlays in a given period of time (including depreciation and other non-cash expenses)
killing: a very large profit

net profit (noun)	killing (noun)
the excess of revenues over outlays in a given period of time (including depreciation and other non-cash expenses)	the act of terminating a life
	an event that causes someone to die
	a very large profit

net profit (adjective)	killing (adjective)
	very funny