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.
rudeness ruddiness redness redenies reediness ruttiness rowdiness readiness rottenness reddens retenes retunes retines routines rootiness rutins redans redons radons rattens retinas radians retains ratines ratanies ratteens retinues reattains ratans
dueness wideness cuteness lateness rudeness liteness muteness whiteness nudeness reediness voidness bawdiness soddenness retenes lewdness rowdiness knottiness rootiness fattiness nattiness patness goodness moodiness meetness sadness quietness muddiness ruddiness seediness neotenies shadiness woodiness wittiness mateyness whatness weediness tidiness tattiness doughtiness deadness neatness suddenness readiness rottenness madness oddness pottiness pettiness goutiness butenes redness bittiness dienes meatiness gaudiness neediness cattiness haughtiness matiness ruttiness hotness nuttiness giddiness beadiness battiness tenues sootiness fatness badness redenies wetness codeines jettiness mootness headiness denes dunness hiddenness denies leadenness ketenes dottiness fitness dowdiness tautness titaness loudness witness woodenness chattiness shoddiness