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.
shippens shippons cheapens choppiness chopins
lippens shippens happens pens deepens peons opens speans sapiens ripens reopens peins penis copens peens peans spense cheapens penes pippins shippons