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.
colleens collins colons cleans colins colonus colones callans cleanse coolness colonies galleins galleons cullions clans glens clons cleanness clines clones clonus clowns gleans callowness kaolins gallons galenas colonise colonize galloons kaolines glueyness glans kilns gluons
colleens baleens lens woolens silenus pollens pleons mullens melenas gleans leans lenes lenis lenos lense liens aliens glens villeins mulleins cleans oleins galenas poleyns galleins rellenos galleons xylenes flense woollens