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.
troll trolly trolley trill trull triol droll drolly tirl terrella trial drill trawl trail drool truly drooly torula dariole tearily torulae trawley hydrilla dirl
roll troll payroll droll reroll girolle grill growl rill prole pyrola drill frill trill prowl carrell nerol drolly parol trull pyrrole brolly krill parole pyrrol broil brill role roil corolla neroli criollo caroli carol drool triol prill trolly shrill
taro tiro toro trio trow troy tyro strow stroy