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.
leanness leans lenes lanes leones lianes lowness lens lioness liens lance lenis linns lunes lines lawns loans lenos lense lanais lanose lauans lianas llanos lunies looneys loonies lins linos lions loins loons lunas
vainness leanness wanness meanness dunness keenness ness ninnies gooeyness lioness bonnes bunnies nowness bennes nannies gneiss wryness woeness pannes pinnies hinnies donnees fewness funnies nines fannies nones shinnies feyness shinneys nonnews rawness joannes bennies nenes jennies minnies newness johnnies finesse tonnes whinnies shannies lowness pennies coyness sonnies dueness tennies tunnies gayness gunnies waeness shyness