license vs approve

license is a noun but approve is not a noun.

Word	Noun	Adjective	Verb	Adverb
license	Yes	No	Yes	No
approve	No	No	Yes	No

license (noun)	approve (noun)
the act of giving a formal (usually written) authorization
a legal document giving official permission to do something
freedom to deviate deliberately from normally applicable rules or practices (especially in behavior or speech)
excessive freedom; lack of due restraint

license (verb)	approve (verb)
authorize officially	judge to be right or commendable; think well of
	give sanction to