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.
holloas hollos hollas halloas holloos hulloas holloes hollows hilloas hellos hullos hallos hillos hols hallows halloos helloes hulloos hilloes halloes hollies hulloes hallahs hills howls holes halls hells helos hulls hulas halos haoles haloes holies hoyles heelless hales hilus heels hails heals heils hauls helios hueless
halloas hulloas holloas hilloas willows zillahs tallows pillows sallows niellos ollas mellows mullahs gallows lilos callose cullays hulloos jellos hallows shallows wallas phyllos hilloes helloes follows fellahs halloos villous challas hellos felloes holloes hollos villas halloes hollas hillos fallows fellows hollows hulloes holloos fellas bullous wallows hallahs bellows hallos fillos alloys billows hullos callas mollahs allays allows chollas wallahs duellos scillas cellos nullahs villose paellas mullas mallows quillais gallous callous challahs yellows las
hollo holloa holloo hollow hallo halloa halloo hallow hello hillo hilloa holla holly hullo hulloa hulloo