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.
dumbly dimly dumbbell tumble doomily domal tumuli tombal timely timbal tamely tymbal tambala timbale tombola tombolo tomalley
humbly mumbly rumbly chimbly numbly wambly nimbly dumbly gamble hammily jumble doomily gemmily wamble ramble tamely gamely tymbal moly tombal fumble rumble fimble cymbal seemly dimly nimble tumble timely chummily gimbal timbal mumble rambla roomily umbel emboly chimbley beamily amble jumbal comely gambol family humble wimble homely lamely homily namely sambal symbol bumble gamily chimley foamily shamble
dumb dumbo doum douma duma dummy duomi duomo