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.
spicer spicery spicier spacer spacier supposer
spicer pacer pacier piecer poiser pussier spacer spacier spicery spicier tipsier
spicey spice spicy sepias space spacey spacy specie speise speiss spies aspis espies