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.
vomer foamer foamier fumer fumier
boomer comer omer gomer roomer homer vomer rummier jammer hammer beamier rammier limber lamber boomier jammier member gamer namer cumber summer aimer humeri bummer roamer cummer loamier lumber hummer rhymer dumber yammer shimmery shammer chimere chimer woomera womera timer teemer dimmer seamer smear dammer emeer gammer seemer mere roomier foamer amber camber emmer number gamier mimer maimer hemmer lamer rimier gemmier mummer somber fumer mammer limmer gammier ember omber limier gummer bomber emery rammer reamer rummer camera comber gummier simmer ameer hammier rimer rimmer fumier seamier mummery homier summery foamier doomier dimer tamer timber umber wommera chamber chimera chummier shimmer shmear yummier