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.
spinose spinous spins spines spense supines sapiens spinneys spinnies spans sapience soppiness cioppinos soapiness sappiness spawns speans spence spoons sapiency spooneys spoonies
spinose pianos epinaos pepinos ripienos cioppinos spinous
spin spine spinney spinny spiny supine