barrel vs barrelful

barrel and barrelful both are nouns.

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

As nouns, barrel and barrelful are synonyms defined as:

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

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

barrel (verb)	barrelful (verb)
put in barrels