drinking vessel vs vessel

drinking vessel and vessel both are nouns.

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

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

drinking vessel (noun)	vessel (noun)
a vessel intended for drinking	a craft designed for water transportation
	an object used as a container (especially for liquids)
	a tube in which a body fluid circulates