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.
dottiness doughtiness dowdiness tattiness detinues titaness duotones tidiness tautness detainees dittanies detains deadness tetanies titans tautens tetanus tetanise tetanize titanias titanous
battiness chattiness goutiness rootiness dottiness pettiness ruttiness sootiness tattiness meatiness doughtiness nuttiness cattiness matiness knottiness bittiness wittiness pottiness nattiness fattiness jettiness haughtiness tines routines mutines reediness patness tineas weediness fatness readiness titaness mutinies shadiness giddiness hotness mootness ratines tidiness poutines retines witness moodiness woodiness muddiness ruddiness bawdiness dowdiness whatness voidness gaudiness muteness betaines rowdiness patines wetness neediness headiness seediness fitness quietness detinues neatness matinees tautness liteness retinues meetness whiteness beadiness lateness cuteness shoddiness tins