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.
boughs bousy bouse bus bos buss buys boos bows boss boys boas busy bios bowse beaus buoys bossy bowwows bas bes bis bys bioassay
boughs haughs heughs doughs choughs shaughs sheughs ghis