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.
betonies betons betaines botanies batons butanes buttons boutons butenes botanise bedouins botanize battiness beadiness bittiness badness battens beduins bedunce biotins boudins bawdiness
atonies betonies toonies tetanies dittanies redenies hypotonias mutinies ketones botanies deionize denies donees donsie tawnies tennies tones photoionize townies litanies tunnies neotenies adonis ratanies atones stones atonias duotones tonnes teutonize
beton betony baton botonee botonnee