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.
spawns spans speans spins spoons spense spines spinous supines spinose sapiens spinneys spoonies spinnies spooneys sappiness soapiness soppiness spence sapience sapiency
pawns spawns taipans speans spans papains kneepans japans pianos pians peans pansy pans panes pains paeans teopans