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.
spoons spoonies spooneys spins spans spawns speans spense spines spinous spinose sapiens supines spinneys spinnies sappiness soapiness soppiness spence sapience sapiency
poons spoons youpons yapons weapons douppionis doupionis depones coupons capons gipons jupons pons pones pions peons peones paeons shippons yaupons yupons