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.
cummers cumbers gummers comers cambers cameras combers gammers commerce cumbrous coumarous gamers gomers camorras gambiers gambirs
bummers summers mammers limmers shimmers mummers hemmers rammers gummers hummers rummers yammers dammers simmers dimmers rimmers gammers emmers shammers cummers hammers jammers foamers roomers ombers teemers reimmerse cameras comers boomers rimers seamers reamers combers rhymers emeers fumers immerse umbers wommeras limbers chambers chimeres gamers timbers embers shmears vomers meres seemers chimers bombers tamers dammars gomers numbers members aimers maimers omers ameers dimers namers cambers lambers roamers cumbers humerus womeras woomeras ambers chimeras homers mimers smears lumbers timers
cummer cumber gummer scummer scummier