loving cup vs drinking vessel

loving cup and drinking vessel both are nouns.

Word	Noun	Adjective	Verb	Adverb
loving cup	Yes	No	No	No
drinking vessel	Yes	No	No	No

As nouns, drinking vessel is a hypernym of loving cup; that is, drinking vessel is a word with a broader meaning than loving cup:

loving cup: a large drinking vessel (usually with two handles) that people drink out of in turn at a banquet
drinking vessel: a vessel intended for drinking

loving cup (noun)	drinking vessel (noun)
a large metal vessel with two handles that is awarded as a trophy to the winner of a competition	a vessel intended for drinking
a large drinking vessel (usually with two handles) that people drink out of in turn at a banquet