filthy lucre vs net profit

filthy lucre and net profit both are nouns.

Word	Noun	Adjective	Verb	Adverb
filthy lucre	Yes	No	No	No
net profit	Yes	No	No	No

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

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

Other hypernyms of filthy lucre include earnings, lucre, net, net income, profit, profits.

filthy lucre (noun)	net profit (noun)
shameful profit	the excess of revenues over outlays in a given period of time (including depreciation and other non-cash expenses)