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.
timers timbers dimers tamers timbres dimmers teemers timorous timaraus dimerous tumors tumours dammers tamburs dimerize tamaraos tamburas tumorous tamaraus tambours tambouras tomorrows damars demurs dammars tamaris daymares
boomers roamers gamers rimmers limmers timers cummers mummers reamers rhymers omers hammers maimers rammers gammers gummers mimers bummers chimers hemmers roomers emmers seemers yammers shimmers aimers summers rimers dimers dammers jammers seamers dimmers mammers rummers shammers homers teemers hummers tamers fumers gomers vomers foamers simmers comers namers bombers humors cumbers cambers embers simars ombers limbers ameers demurs chimeres cameras chambers emirs humerus mars ambeers reimmerse gambiers combers meres shmears chimars rumors umbers ambers chimeras mirs lambers chimaeras tumors mors cymars emeers smears woomeras dammars numbers lumbers timbers lemurs immerse damars femurs wommeras womeras amirs members
timer dimer tamer timarau timber timbery timbre