butter churn vs vessel

butter churn and vessel both are nouns.

Word	Noun	Adjective	Verb	Adverb
butter churn	Yes	No	No	No
vessel	Yes	No	No	No

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

butter churn: a vessel in which cream is agitated to separate butterfat from buttermilk
vessel: an object used as a container (especially for liquids)

butter churn (noun)	vessel (noun)
a vessel in which cream is agitated to separate butterfat from buttermilk	a craft designed for water transportation
	an object used as a container (especially for liquids)
	a tube in which a body fluid circulates