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.
helo hello helio halo heel heil hell heal hillo hullo hallo hollo holloa hollow hilloa hulloo halloa holloo hallow halloo hulloa hill hull hall haul hail hili hale holy howl hole hula hila haole hilly holey holla holly hooly hoyle