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