patent leather vs leather

patent leather and leather both are nouns.

Word	Noun	Adjective	Verb	Adverb
patent leather	Yes	No	No	No
leather	Yes	No	Yes	No

As nouns, leather is a hypernym of patent leather; that is, leather is a word with a broader meaning than patent leather:

patent leather: leather with a hard glossy surface
leather: an animal skin made smooth and flexible by removing the hair and then tanning

patent leather (noun)	leather (noun)
leather with a hard glossy surface	an animal skin made smooth and flexible by removing the hair and then tanning

patent leather (verb)	leather (verb)
	whip with a leather strap