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.
pleons pylons poleyns pollens plans paleness pillions plains planes polonaise paulownias paulins plainness pliancy
galleons pleons gluons leans belons clones colleens clonus colons silenus halons billons villeins cullions gallons felons gleans bullions galleins lions solons mulleins chalones woolens ballons talons zillions baleens mullions rellenos aloins salons oleins melons loons lenes pollens jillions aliens flense colones galenas loans violones cleans colonus glens saloons hellions clons lens galloons loins liens eloins lense leones balloons clowns pylons poleyns pillions nylons billions lenos reloans millions lenis solions melenas xylenes talions mullens toluenes woollens bouillons shalloons
pleon pelon plena poleyn pylon spleen spleeny splenia splenii