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.
quietest quietist cutest gaudiest goutiest guttiest cattiest coattest
quietest retest detest test rattiest footiest meatiest phattest haughtiest hootiest hottest fittest ruttiest mutest knottiest zootiest neatest fattiest nittiest peatiest pietist poutiest latest dotiest doughtiest tautest wettest whitiest chattiest coattest nattiest testa nettiest fattest attest testy cattiest cutest guttiest bittiest featest mitiest jettiest quietist gnattiest nuttiest goutiest pettiest pottiest rootiest sootiest battiest matiest dottiest tattiest wattest whitest wittiest shittiest
quiets quietus quits quoits equites equities