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.
whimsy whimsey whims whams whomso whammies wames wamus wombs wammus
whimsy limes chimes maims whims dims sims bimas vims hims limas limbs aims missy limos mimes nims pimas rimes rims simas dimes times whimsey chimbs shims
whim wham whammo whammy whamo whom swim swimmy