quince liqueur vs liqueur

quince liqueur and liqueur both are nouns.

Word	Noun	Adjective	Verb	Adverb
quince liqueur	Yes	No	No	No
liqueur	Yes	No	No	No

As nouns, liqueur is a hypernym of quince liqueur; that is, liqueur is a word with a broader meaning than quince liqueur:

quince liqueur: any of a variety of strong alcoholic liqueurs made from quince fruit.
liqueur: strong highly flavored sweet liquor usually drunk after a meal

Other hypernyms of quince liqueur include cordial.

quince liqueur (noun)	liqueur (noun)
any of a variety of strong alcoholic liqueurs made from quince fruit.	strong highly flavored sweet liquor usually drunk after a meal