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.
fulls fouls fills falls fuels fells follis fellas filles fillos folles follies fils fallows follows fellahs fillies failles felloes fellows fellies flus files flues foils filos false flows fools fleas fowls feels floes flies fleys floss vills flees fails flays foals flews flaws folios ghylls villas villus flossy foleys filose floosy ghouls falsie floosie foliose villose fallacy feeless phallus flossie phyllos valleys folious villous volleys ghillies ghoulies
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
full fully fuel fillo fallow foully foul folly follow filly fill fell felly fall fellow felloe fellah fella fille