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.
biopsies bypasses
gipsies gypsies popsies biopsies psis coppices lipases apices capizes puses eposes apses reopposes capsize poussies copses apsis opposes tapises upsize lapises reposes pases apposes gaposis posies lapses poses lupuses poesies opuses supposes sepsis pussies sepses spices deposes upases woopses