Campobasso rhymes with:
barrasso, burkina-faso, capasso, caporaso, caso, chiasso, ditomasso, ditommaso, faso, galasso, jaso, kossow, lofaso, lograsso, losasso, naso, picasso, raso, rossow, sorpasso, tomaso, tomasso, trapasso, yasso
Campobasso sounds like:
cambex, camby's, camp's, campeau's, campise, campisi, campos, camps, camps', campus, campuses, cannabis, canvas, canvases, canvass, canvasses, champoux, champs, chemfix, chimps, combes, combs, comeback, comebacks, compaq, compaq's, compas, compass, compose, composes, compus, compusa, compusa's, confess, confesses, confucius, confuse, confuses, convex, conveys, convoys, coombes, coombs, cumbias