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.
sedan soudan seitan stane stein steno stain seton satin sateen sudden sadden sitten satiny cetane sodden zeatin soutane stun
redan sedan dan dawn dean median radian redon soudan hyoidean
seat seed seedy seta setae soda sued suede seaside used