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.
cheapens cheapness chopins shippens chopines shippons choppiness
cheapens pens shippens deepens penes weapons spense sapiens reopens paeons peans peens peins speans paeans peons happens japans capons copens lapins lippens opens ripens penis yapons