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.
tidiness titaness dowdiness dottiness tattiness doughtiness tautness detinues deadness detainees dittanies titans detains duotones tetanies titanias titanous dedans
bawdiness neediness chattiness fattiness rowdiness nuttiness moodiness dottiness muddiness tattiness doughtiness battiness readiness sootiness ruddiness knottiness bittiness ruttiness weediness pottiness shoddiness pettiness dowdiness woodiness shadiness beadiness goutiness jettiness rootiness reediness nattiness seediness tidiness cattiness haughtiness matiness giddiness headiness wittiness meatiness gaudiness redness quietness iodines tines mateyness dueness meetness voidness liteness rottenness muteness retinues oddness retines fitness detinues patines whatness lewdness lateness mutinies poutines matinees routines codeines patness suddenness leadenness tautness dunness wideness neatness badness mutines tineas hotness dines betaines mootness loudness dienes hiddenness cuteness ratines deadness sadness detainees wetness soddenness whiteness madness witness rudeness woodenness titaness goodness nudeness fatness