income tax bracket vs tax bracket

income tax bracket and tax bracket both are nouns.

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

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

income tax bracket and tax bracket: a category of taxpayers based on the amount of their income

Other synonyms of income tax bracket include income bracket.

income tax bracket (noun)	tax bracket (noun)
a category of taxpayers based on the amount of their income	a category of taxpayers based on the amount of their income