parfait glass vs drinking glass

parfait glass and drinking glass both are nouns.

Word	Noun	Adjective	Verb	Adverb
parfait glass	Yes	No	No	No
drinking glass	Yes	No	No	No

As nouns, drinking glass is a hypernym of parfait glass; that is, drinking glass is a word with a broader meaning than parfait glass:

parfait glass: a tall slender glass with a short stem in which parfait is served
drinking glass: a container made of glass for holding liquids while drinking

Other hypernyms of parfait glass include glass.

parfait glass (noun)	drinking glass (noun)
a tall slender glass with a short stem in which parfait is served	a container made of glass for holding liquids while drinking