excise tax vs sales tax

excise tax and sales tax both are nouns.

Word	Noun	Adjective	Verb	Adverb
excise tax	Yes	No	No	No
sales tax	Yes	No	No	No

As nouns, sales tax is a hyponym of excise tax; that is, sales tax is a word with a more specific, narrower meaning than excise tax:

excise tax: a tax that is measured by the amount of business done (not on property or income from real estate)
sales tax: a tax based on the cost of the item purchased and collected directly from the buyer

Other hyponyms of excise tax include nuisance tax, ad valorem tax, gasoline tax.

excise tax (noun)	sales tax (noun)
a tax that is measured by the amount of business done (not on property or income from real estate)	a tax based on the cost of the item purchased and collected directly from the buyer