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.
limply lumpily
imply simply dimply limply jimply damply rumply amply comply pimply ample temple ampul lumpily coemploy jumpily simple sample rumple rimple reemploy bumpily impel pimple semple employ dimple campily dumpily compel wimple
limp limpa lamp lump lumpy blimp