income tax return vs tax return

income tax return and tax return both are nouns.

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

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

income tax return and tax return: document giving the tax collector information about the taxpayer's tax liability

Other synonyms of income tax return include return.

income tax return (noun)	tax return (noun)
document giving the tax collector information about the taxpayer's tax liability	document giving the tax collector information about the taxpayer's tax liability