When it comes to finding synonyms for the word "barrel-shaped", there are a few options to choose from. One suitable alternative could be "cylinder-shaped", which conveys a similar meaning. Another possibility might be "drum-like" or "keg-shaped", which both evoke the image of a barrel. "Bulbous" or "rounded" could also work, as they describe a shape that is similar to a barrel but perhaps not as specifically. In any case, choosing the right synonym will depend on the context in which the word will be used and the tone or style of the writing or speech.