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.
ramble rambla rumble ramilie ramal ramillie rumbly remail roomily
bumble rumble gamble wamble fimble mumble amble shamble wimble jumble ramble tumble fumble humble nimble mole mile amole tamale numbly jumbal timbale chimbley gimbal dumbly gambol wambly cymbal chimley umbel simile gemmule male female symbol rumbly timbal mule rambla chimbly sambal mumbly smile tymbal humbly nimbly tombal
ram frame drama pram gramma grama gram crambo crambe cram arame ramee rumba roam ream rammy ramie rami gramme dram tram