clearance vs license

clearance and license both are nouns.

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

As nouns, license is a hypernym of clearance; that is, license is a word with a broader meaning than clearance:

Other hypernyms of clearance include permission, permit.

clearance (noun)	license (noun)
permission to proceed	the act of giving a formal (usually written) authorization
the distance by which one thing clears another; the space between them	a legal document giving official permission to do something
vertical space available to allow easy passage under something	freedom to deviate deliberately from normally applicable rules or practices (especially in behavior or speech)
	excessive freedom; lack of due restraint

clearance (verb)	license (verb)
	authorize officially