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.
rowboat robot rabat rubati reboot rebato rebate rubato rabato rebait rubout rebought rebut robed rabbet rabbit rebody robbed rabbity
rowboat towboat showboat boat bat bot