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.
rumbler rambler
ambler gambler fumbler nimbler jumbler humbler mumbler rambler bumbler rumbler tumbler miler cymbaler seemlier smiler temblor tummler wamblier
rumble rumbly rambla ramble crumble crumbly grumble grumbly drumble drumly