license tax vs licensing fee

license tax and licensing fee both are nouns.

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

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

license tax and licensing 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 license fee.

license tax (noun)	licensing 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)