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.
caymans caimans camions kamaainas cumins gamins gammons gamines cummins commons combines communes gameness gaminess communise commonness kimonos
caymans mans womans domains damans simians romanos remains lemans hymens hymns mains manas manes manos manus manse means moans bemeans bemoans humans caimans limans remans romans somans demeans tomans shamans