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.
helped helipad
helped palped whelped yelped kelped pulped gulped louped milliped milleped ycleped galloped beleaped blipped clapped filliped eloped looped blooped salpid sliped sloped dewlapped taliped lapped clupeid shlepped polyped leaped loped galoped clipped millipede millepede flapped lolloped plopped lopped flopped clopped glopped lipped flipped cleped bleeped slapped slipped slopped dolloped walloped cheliped aliped