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.
timbery timber timer timbre tamer dimer tambur teemer dumber dimmer tambura timarau tambour tamboura tumor dammer tumour doomier tamarao tamarau
ambery timbery chambray wombier ember omber mummery lumber limber lambier lamber gambier cumber comber camber emery merry somber ambry amber ambeer ambary limbier member number smeary summery timber bomber dumber umber chamber shimmery