revenue vs tax revenue

revenue and tax revenue both are nouns.

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

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

Other synonyms of revenue include tax income, taxation.

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