barrelful vs barrel

barrelful and barrel both are nouns.

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

As nouns, barrelful and barrel are synonyms defined as:

barrelful and barrel: the quantity that a barrel (of any size) will hold

barrelful (noun)	barrel (noun)
the quantity that a barrel (of any size) will hold	a cylindrical container that holds liquids
	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

barrelful (verb)	barrel (verb)
	put in barrels