driving license vs driver's license

driving license and driver's license both are nouns.

Word	Noun	Adjective	Verb	Adverb
driving license	Yes	No	No	No
driver's license	Yes	No	No	No

As nouns, driving license and driver's license are synonyms defined as:

driving license and driver's license: a license authorizing the bearer to drive a motor vehicle

Other synonyms of driving license include driver's licence, driving licence.

driving license (noun)	driver's license (noun)
a license authorizing the bearer to drive a motor vehicle	a license authorizing the bearer to drive a motor vehicle