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.
spang spaeing spank siping spuing supping souping sopping soaping sipping seeping sapping spunk spunky spunkie zapping zipping
pang spang hooping fopping sipping sopping riping capping quipping oping couping napping seeping leaping pepping happing mopping raping coping gawping jauping mapping lopping wrapping bopping gypping hoping looping beeping whipping yawping yapping wapping shipping chopping typing cheeping wiping tipping whopping whapping reaping hopping zipping heaping roping supping topping kepping taping popping dipping duping pipping copping gaping cupping cooping kipping peeping nipping siping hyping hipping gipping ripping gapping sapping keeping lipping moping piping louping lapping knapping pong aping repping loping pooping panga ping japing pung doping dapping soaping dupping rouping toping spank jeeping rapping zapping pupping weeping souping whooping tapping whupping chapping tupping chipping shaping upping shopping yauping wheeping yipping
span spawn spean spin spine spinney spinny spiny spun