impose vs tax

impose is not a noun while tax is a noun.

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

As verbs, tax is a hyponym of impose; that is, tax is a word with a more specific, narrower meaning than impose:

Other hyponyms of impose include toll, tithe, reimpose, lay, fine, mulct, distrain.

impose (noun)	tax (noun)
	charge against a citizen's person or property or activity for the support of government

impose (verb)	tax (verb)
impose something unpleasant	make a charge against or accuse
impose and collect	use to the limit
compel to behave in a certain way	levy a tax on
	set or determine the amount of (a payment such as a fine)