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.
boulle boule bullae bole boll bull bully belle bulla billie ball bell bola boil bile blae bale blue bolo buhl blew bill bowl bluey bally billy boyla belie belly bailee bailie blooey billow bellow blooie bailey billowy bal bel
boulle tulle belle volley null alley mulley mule mull pule valley hullo mollie lull mallei collie galley cull pulley joule tuille challie dully wellie bullae bulla gully quale boule ghillie gull sully billie cellae bull rouille allee nellie coulee foully fille cully callee mallee quoll mille gillie tule ghoulie muley mouille mulla full bully quill villae hull fully pull felloe rille faille rule gulley selle pollee dull killie taille quell wallie willie guile yule