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.
warrant warranty warrantee warned whereinto whereunto
arrant warrant currant errant rant errand brant truant horrent hydrant jurant guaranty riant grant variant coranto courant maranta courante torrent couranto tyrant current warranty