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.
currant current courant couranto courante coranto guaranty grant craniate guarantee craned gurnet cornet carnet coronet crenate crownet grantee crinite granite granita crannied coronate carinate grunt grand carronade corned garnet crooned grained grandee cairned cornute cornuto groaned crowned crunode crinoid kernite
arrant warrant currant errant rant errand brant truant horrent hydrant jurant guaranty riant grant variant coranto courant maranta courante torrent couranto tyrant current warranty