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.
dunnest tannest downiest tinniest dynast density dynasty tennist tiniest toniest tawniest teeniest danced tanist tensity
funnest tannest dunnest wannest nest boniest boneset neist viniest fawniest honesty funest phoniest mooniest puniest ginniest canniest funniest keenest sunniest downiest liniest teeniest tiniest toniest luniest wenniest whinniest sheeniest rainiest finest fainest renest bonniest meanest vainest veiniest honest finniest gooniest fenniest piniest looniest runniest punniest sanest cineast soonest zaniest leanest tawniest tennist tinniest waniest weeniest whiniest winiest shiniest
dunness donnees dueness duennas dunce dunes