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.
matiest meatiest mitiest mutest maddest midst moodiest muddiest matzot modest modesty modiste miticide
bittiest matiest chattiest nattiest zootiest tattiest sootiest goutiest footiest wittiest doughtiest whitiest jettiest nettiest pottiest rootiest nittiest meatiest guttiest shittiest cattiest nuttiest ruttiest fattiest peatiest dottiest gnattiest pettiest haughtiest hootiest poutiest mitiest battiest dotiest knottiest rattiest test mutest batiste detest featest bawdiest reediest cutest fattest quietist coattest quietest muddiest rowdiest dowdiest deediest whitest widest woodiest weediest chutist lutist testy autist fittest latest beadiest readiest duettist tidiest neatest faddiest phattest attest retest testa doughiest tautest hoodiest wettest seediest neediest wattest giddiest gaudiest headiest leadiest ruddiest pietist hottest shadiest moodiest shoddiest