earnings vs income

earnings and income both are nouns.

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

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

earnings: the excess of revenues over outlays in a given period of time (including depreciation and other non-cash expenses)
income: the financial gain (earned or unearned) accruing over a given period of time

earnings (noun)	income (noun)
something that remunerates	the financial gain (earned or unearned) accruing over a given period of time
the excess of revenues over outlays in a given period of time (including depreciation and other non-cash expenses)