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.
boss bossy bos boas boys buss boos bass bios bows bioassay bowse bouse byssi bassy bassi bousy basso buoys boughs bys bas bis bes bus bowwows bozo buys bees baas base beys bays bias busy bise bazoo beaus booze boozy
boss foss joss coss koss loss moss doss toss os