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.
upases upsize
peases lipases upases capiases appeases pases opuses posses pisses peaces apses peises lapses pussies lupuses lapises popsies bypasses papooses poses repasses repossess sepses speises spouses deposes tapises gipsies pusses topazes poises posies puses apposes biopsies eposes gypsies paseos opposes possess copses pauses passes paces poesies pappooses reopposes reposes repousses spaces speisses supposes diapauses poussies woopses