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.
hollooing holloing hullooing hallooing holloaing hulloing halloing helloing hilloing hollaing holing hilloaing halloaing hulloaing howling haloing helling hilling hulling haling hailing hauling healing heeling heiling
looing hallooing hullooing hollooing tooling siloing nielloing haloing hulloing folioing fooling halloaing halloing helloing hilloaing hilloing holloaing holloing hulloaing cooling pooling soloing shooling ling long