license tax vs license fee

license tax and license fee both are nouns.

Word	Noun	Adjective	Verb	Adverb
license tax	Yes	No	No	No
license fee	Yes	No	No	No

As nouns, license tax and license fee are synonyms defined as:

license tax and license fee: a fee paid to the government for the privilege of being licensed to do something (as selling liquor or practicing medicine)

Other synonyms of license tax include licensing fee.

license tax (noun)	license fee (noun)
a fee paid to the government for the privilege of being licensed to do something (as selling liquor or practicing medicine)	a fee paid to the government for the privilege of being licensed to do something (as selling liquor or practicing medicine)