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.
lipases lapses lapises lupuses lapsus
pases lipases upases reposes eposes apposes bypasses tapises deposes spaces reopposes biopsies gypsies lapises lupuses apses lapses copses opuses puses appeases repasses gipsies paces topazes diapauses supposes sepses popsies poses opposes capiases paseos passes pauses peases woopses
lipase lips blips flips clips slips