killing vs lucre

killing and lucre both are nouns.

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

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

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

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

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

killing (adjective)	lucre (adjective)
very funny