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.
paces peaces puces pases poaceous paseos passes pieces peases pauses piceous poses psoas puses pesos peises pusses posies pisses passus pizzas paisas poises posses piazzas poesies possess pussies poussies psis
faces daces taces hyraces maces laces races aces paces peaces eases faeces lycees fices cases saices biases vases pases syces vices sauce fazes gases dazes feazes fauces fasces peases mazes juices puces saice sycees deices dices phases gazes chases pieces diocese lazes cees voces baases leases fyces nieces bices feces lases ceases sauces razes ices oases rices dioecies facies luces cess voices bases hazes rases recess rosacea sices deuces feases teases duces choices
pace pacey pacy pase paseo peace pice puce apace space spacey spacy spaes