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.
titaness titans tetanies titanias tidiness tautness titanous dittanies tattiness dottiness tetanus doughtiness detinues deadness tetanize tetanise detainees dowdiness detains tautens duotones dedans
titaness mateyness moodiness ratanies weediness beadiness goodness jettiness dottiness rowdiness nudeness badness leadenness bawdiness litanies rudeness dueness muddiness neatness bittiness cuteness rootiness oddness knottiness wideness shadiness wittiness whatness tidiness dowdiness deadness redness headiness dunness hotness woodiness tautness stanes battiness cetanes loudness seediness meatiness sootiness pettiness betaines madness lateness cattiness butanes nattiness mootness goutiness ruddiness lewdness fitness voidness nuttiness neediness rottenness dittanies giddiness gaudiness fattiness quietness pottiness meetness reediness muteness fatness woodenness patness soddenness matiness sadness liteness ruttiness phytanes soutanes tattiness hiddenness whiteness botanies haughtiness readiness suddenness doughtiness tetanies wetness witness chattiness shoddiness