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.
bubs bubus bubbas buboes bibs bobs boubous bubbies baubees bibbs babus babes babas boobs babies baboos bawbees beebees bobbies boobies booboos booboisie
bubs fubs hubs cubs nubs pubs rubs subs daubs dubs tubs chubs