licensing fee vs license tax

licensing fee and license tax both are nouns.

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

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

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

Other synonyms of licensing fee include license fee.

licensing fee (noun)	license tax (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)