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.
holloos hollos halloos hulloos holloes hollows holloas hollas hullos hillos hellos hallos hols halloas hollies hulloes helloes halloes hilloes hulloas hallows hilloas howls halos halls hells holes hills hulls helos haloes helios hoyles holies haoles hallahs heelless heals hulas hails hauls hilus hales heels heils hueless
halloos holloos hulloos loos holloes halloes fillos halloas hallos helloes villous phyllos holloas hollos villose hilloas hillos jellos callous gallows mallows niellos cellos duellos wallows shallows floosy hulloas hilloes hellos loose bullous billows bellows alloys fellows fallows follows hallows felloes allows hollows hulloes hullos callose gallous lilos mellows pillows sallows tallows willows yellows
hollo holloa holloo hollow hallo halloa halloo hallow hello hillo hilloa holla holly hullo hulloa hulloo