I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
bulla bullae bull bully boulle boll blae blaw bell buhl blah ball bola bill belay bally boyla billy boule bylaw belle belly billie billow bellow billowy bal bel bail bale boil bowl bolo blew baal bile bole blue bawl blow
bulla mulla cully cull hulloa holloa hilloa hull foully hallah halloa villae villa fully full quoll fellah null olla pallia pull cellae sully doula dull tulle wallah challah mollah gully hullo gull quill lull mull fella bully bullae boulle bull quillai holla allay hula cullay calla quell mullah nullah paella pula cella scilla zillah dulia dully walla challa cholla