government revenue vs income

government revenue and income both are nouns.

Word	Noun	Adjective	Verb	Adverb
government revenue	Yes	No	No	No
income	Yes	No	No	No

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

government revenue: income available to the government
income: the financial gain (earned or unearned) accruing over a given period of time

government revenue (noun)	income (noun)
income available to the government	the financial gain (earned or unearned) accruing over a given period of time