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.
spinnies spinneys spines supines spins spoonies soppiness sappiness soapiness spinous spinose sapiens spooneys sapience spans spawns speans spence spense spoons sapiency cioppinos
pennies pinnies spinnies pannes pennis peonies ponies openness spinneys spoonies
spinney spinny spin spine spiny supine