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.
mull mulla mulley mullah mule mell moll maul mall mill mouille molly mille muley miaul muhly maill mollie mellow mallow mallee mallei mollah mol mil mel mole mile milo mola mool mail mewl meal moly moil male maile mealy melee milia moola
bull full hull cull gull lull mull null pull dull