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.
format formate fermata fermate formed furmety furmity fremd farmed firmed framed
format doormat trymata hermit roommate armet bromate fermata ramate fermate remate crewmate formate gourmet marmot neuromata permit cermet cremate primate traumata chromate
form forme formee farm fermi firm foram forum frame from