tax income vs tax revenue

tax income and tax revenue both are nouns.

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

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

Other synonyms of tax income include revenue, taxation.

tax income (noun)	tax revenue (noun)
government income due to taxation	government income due to taxation