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.
termor termer tremor trimer trimmer
armor termor wormer tremor rumor rumour armer armory armour farmer remora former harmer murmur ormer paramour dormer termer firmer warmer charmer
term derm derma tearoom teraohm tram trim trumeau tryma iterum