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.
slump
lump clump plump slump shlump flump clumpy taillamp rollmop glumpy lumpy clomp clamp blimp limp lamp shlumpy
slummy slum salmi slam slim slime slimy solum