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.
spoonies spooneys spoons spinnies spines supines sapiens spinneys spins spans sappiness soppiness soapiness spawns speans spence spense spinose spinous sapience sapiency
ponies peonies spoonies hyponeas pennies peones pinnies pones caponize spinnies spooneys depones doupionis douppionis weaponize