government revenue vs government income

government revenue and government income both are nouns.

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

As nouns, government revenue and government income are synonyms defined as:

government revenue and government income: income available to the government

government revenue (noun)	government income (noun)
income available to the government	income available to the government