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.
piazzas pizzas pizzaz pizazz pizzazz pizazzy pizzazzy pazazz paisas psis pisos psoas paces pases peases pieces poises posies passes passus pauses paseos peaces pisses peises piceous poesies pussies
tazzas piazzas baizas huzzahs huzzas jazzes pizzas razzes zas