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.
bioassay bassy bossy boss boas bias bass bios bassi basso bousy bas bos bis baas busy boos bise bows base bays boys buss baiza beaus boozy bouse bowse buoys byssi boughs
assay bioassay assai bassy essay cassia gassy quassia massa massy missay naysay sassy say ass