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.
seamless sumless smiles sambals samiels similes smileys sawmills smalls smells symbols
aimless loamless gumless rimless foamless seamless beamless sumless mealless gambles ambles nameless amoles fimbles bumbles humbles fameless rhymeless miles rumbles smiles fumbles numbles limbless fumeless shambles jumbles tameless males tamales umbles homeless limeless mailless gemmules mules similes tombless mumbles wimbles rambles nombles females timeless tumbles wambles chimleys moles shameless