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.
gumbo gombo gum gamb gaum combo gummy gamba gumma gambe cumbia gambia goombay goombah gam cum camo comb gama game gamy
jumbo dumbo umbo gumbo duomo ambo bamboo bimbo embow combo limbo numb rumba sambo sumo dumb mambo tomboy gombo