keg vs barrel

keg and barrel both are nouns.

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

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

Other hypernyms of keg include cask.

keg (noun)	barrel (noun)
small cask or barrel	a cylindrical container that holds liquids
the quantity contained in a keg	a tube through which a bullet travels when a gun is fired
	any of various units of capacity
	the quantity that a barrel (of any size) will hold
	a bulging cylindrical shape; hollow with flat ends

keg (verb)	barrel (verb)
	put in barrels