killing vs earnings

killing and earnings both are nouns.

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

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

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

Other hypernyms of killing include lucre, net, net income, net profit, profit, profits.

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

killing (adjective)	earnings (adjective)
very funny