Synonyms for Barrel (same or very similar meaning)
WordNet sense 1 (a bulging cylindrical shape; hollow with flat ends):
drumWordNet sense 2 (the quantity that a barrel (of any size) will hold):
barrelfulWordNet sense 3 (any of various units of capacity):
bblWordNet sense 4 (a tube through which a bullet travels when a gun is fired):
gun barrelWordNet sense 5 (a cylindrical container that holds liquids):
caskFrom the ODE community, based on WordNetadd/edit