revenue vs tax income

revenue and tax income both are nouns.

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

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

Other synonyms of revenue include tax revenue, taxation.

revenue (noun)	tax income (noun)
the entire amount of income before any deductions are made	government income due to taxation
government income due to taxation