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.
boas bas bos bows bass bios baas base boys boos boss bias bays bioassay bouse bossy bassy beaus basso bowse bousy buoys bassi boughs bis bys bes bus bowwows bise busy buys buss beys bees bozo baiza baize bazoo booze boozy byssi