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.
leanest lancet liniest luniest lanosity looniest lanced lensed linseed
meanest leanest sanest nest fainest funnest canniest honesty viniest fawniest finniest funniest fenniest neist funest gainst rainiest bonniest pianist boniest finest sunniest downiest tanist tawniest tiniest toniest wannest wenniest whinniest sheeniest puniest runniest lancet renest boneset punniest piniest mooniest looniest phoniest luniest cineast keenest gooniest canst ginniest vainest honest liniest veiniest soonest zaniest dunnest tannest teeniest tinniest waniest weeniest whiniest winiest shiniest
lance lanes leanness leans lenes lense leones lianes flanes cleanness cleans cleanse gleans planes