earnings vs net profit

earnings and net profit both are nouns.

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

As nouns, earnings and net profit are synonyms defined as:

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

Other synonyms of earnings include lucre, net, net income, profit, profits.

earnings (noun)	net profit (noun)
something that remunerates	the excess of revenues over outlays in a given period of time (including depreciation and other non-cash expenses)
the excess of revenues over outlays in a given period of time (including depreciation and other non-cash expenses)