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.
similes smiles smileys samiels sumless sawmills seamless smalls smells sambals symbols
miles similes smiles mils mills males mails mailes emails milos females aimless amoles milles foamless mumbles gumless ramilies rimless samiels seamless gemmules sumless tumbles wambles chimleys numbles camails ambles fimbles homilies gambles beamless bumbles families mules fumbles moils loamless nombles moles jumbles rambles remails rumbles sawmills humbles smileys tamales umbles wimbles shambles