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.
weapons weaponize weepiness
capons yapons weapons pons pions youpons pones gipons shippons paeons peons lapins poons coupons spoons depones cheapens jupons yaupons japans yupons