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