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.
whimseys whimsies wamuses wammuses
whimseys moseys hummuses wammuses tamises demises zymases momuses kumyses remises muses amuses bemuses emeses phimoses shamuses chamises vamoses hommoses koumyses wamuses tmeses demoses zymoses semises mimeses nemeses mises koumises gummoses camises camases humuses chemises whimsies siameses
whims whimsey whimsy whams whomso swims