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