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.
holloo hollo holloa hulloo hollow halloo holla hullo hallo hillo holly hello hilloa hulloa hallow halloa holy hull hall halo helo howl hole hell hill haole hilly holey hooly hoyle hallah hoolie
halloo holloo hulloo loo fallow billow bellow alloy allow fillo hillo felloe hello fellow follow niello cello duello wallow shallow mallow callow halloa hilloa hollow hallo hulloa hallow hullo jello holloa hollo lilo mellow phyllo pillow sallow tallow willow yellow