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.
piceous poaceous pieces pisos puces paces pesos pisses peaces paseos posies peises poises poesies psis poussies pases psoas poses puses paisas passes passus pauses peases pizzas posses pusses piazzas possess pussies
piceous poaceous vicious caseous gaseous luscious nauseous osseous diecious dioecious