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.
dynast dynasty dunnest downiest tanist tannest tennist tiniest toniest downside tawniest teeniest tenacity tinniest
dynast nasty dynasty dunnest soonest cineaste renest moonset meanest hyponasty fainest finest funest funnest vainest unset tannest honest inset hymnist nest sunset sanest cineast pianist monist onset hygienist leanest keenest gainst canst canasta tennist tanist wannest