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.
whomso whams whims wombs whimsy whimsey whammies wames wamus wammus
whomso oms nomos mosso gnomes nomes biomes bombs moms foams zooms caeomas noms somas doms roms doums poms tombs pomes toms wombs homes momus booms domes nomas looms loams momes comes combs soms coombs miso rooms roams dooms pomos duomos poems tomes ohms comas homos chamiso
whom wham whammo whammy whamo whim womb womby