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.
silenus selenous selenious silanes silence soleness silliness solons salons solans sullenness slyness xylenes solanos saloons solions salinas salines salience saliency slowness zillions sallowness
silenus lens woolens leans oleins mulleins glens galleons galenas colonus colleens clonus cleans villeins baleens flense poleyns aliens lense lenos lenis lenes galleins gleans melenas mullens pleons pollens selenous liens rellenos xylenes woollens