barrel vs vessel

barrel and vessel both are nouns.

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

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

barrel (noun)	vessel (noun)
a cylindrical container that holds liquids	a craft designed for water transportation
a tube through which a bullet travels when a gun is fired	an object used as a container (especially for liquids)
any of various units of capacity	a tube in which a body fluid circulates
the quantity that a barrel (of any size) will hold
a bulging cylindrical shape; hollow with flat ends

barrel (verb)	vessel (verb)
put in barrels