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.
hulls hullos hulloas hulloos hulloes halls hulas hells hauls hills hallos hollas hillos hollos hellos hallahs halloes hollies hueless hols holloas hilloas halloos halloas holloos holloes hollows hilloes hallows helloes heelless holes halos hales hails heals helos heels hilus howls heils haloes haoles helios holies hoyles
bulls mulls nulls culls pulls gulls hulls dulls lulls fulls ghylls ghouls molls boules hollas kills maills falls jills fillos caules guls miauls hells caulis hullos villas sulus jellos sauls hallos vills cellos mullas milles joules mills hellos phallus ballsy bills calls ollas balls pules shells pulse hauls tailles talls dills tellys ulus tolls walls wells challas chillis shuls yills duellos tules gills rouilles malls ills selles mells jells ells sills chollas fouls bolls pills dalles gallus doulas rills scillas follis hulas fills rilles hillos boulles mauls failles quells fellas quolls coulis galls gules callus buhls cells jouals niellos knells fells filles hills nills halls folles villus pulis duels hollos belles phyllos quills knolls lulus fuels paellas rules duals callas rolls lalls alls palls chills bells cauls mules lolls cullis souls polls puls tuilles shauls tulles dells dolls dulse tallis sells tells tills zills wallas wauls wills challis shills yells yules
hull hulloo hulloa hullo hall hill hallah holloa hollo holla hilly hilloa hillo hallow hollow hello halloo halloa hallo holloo holly hell hula haul ahull