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.
fainest finest vainest fawniest finniest funest funnest viniest fenniest finessed funniest veiniest fancied phoniest vinosity fenced
finest vainest fainest nest funniest canniest phoniest gooniest veiniest leanest honest meanest funnest piniest punniest inset renest looniest cineast soonest zaniest dunnest tawniest tiniest toniest wannest wenniest whinniest sheeniest funest mooniest finniest puniest fawniest ginniest bonniest gainst boniest keenest fenniest liniest boneset neist luniest viniest rainiest honesty runniest sanest sunniest downiest tannest teeniest tinniest waniest weeniest whiniest winiest shiniest