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.
potpie
potpie tape watape stope tawpie tipi tope topi type biotope biotype etape cotype metope neotype retape retype stipe stupe wattape
pot poet potto potty pout pouty pooped popped poppet poppied spot spotty