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.
falser flosser flossier fleecer fleecier
falser pulser dialyser releaser lousier closer classer flossier flosser bluesier blowsier blousier blesser ballsier laser glosser looser lesser leaser lassoer classier glassier glossier pulsar loser pleaser realiser delouser ulcer
falsie false failles fails fallacy fallows falls fils floss flossie flossy flus foals valse