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.
newness nowness nenes neons nines nones knowns nonnews ninnies nannies nans nuns nonissue naans nanas nonas noons nouns
lowness nowness fewness newness rawness ness townees keenness finesse pawnees feyness waeness tawneys sawneys dueness gneiss woeness vainness leanness coyness wanness wines wryness gayness gooeyness townies wanes tawnies lioness dunness meanness shyness