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.
falls failles fallows false fells fulls foals fills fails falsie filles folles fillos follis fellas flus fillies valleys felloes fils fallacy follies phallus fellahs follows fellows fellies fuels foils vales fleys fowls fools flays flews veals flues vails fleas fouls floss flees vills floes flies flows flaws filos vials valse files feels valise villus filose villas values phials ghylls flossy foleys folios floosy feeless floosie flossie foliose folious phyllos villose villous volleys ghillies
alls palls malls falls balls lalls talls walls halls galls calls als mauls bialis awls gulls also vales callus aals coals balsa callas jells jills bails cells bulls ales cullis gills molls hillos vials hallos dolls hollos boulles baals nails cauls fillos niellos failles kails hullos fellas deals jellos phyllos jails tellys goals dials knells phials ells tails false nalas bales nulls tulles wales rilles rolls jouals taels pulls wells wheals challas duellos pawls chillis chollas shauls zeals sheals teals shills sials yells tolls sells reals maills cellos tales fells folles phallus hulls sals dahls mulls wawls ails pals lolls bawls bells ills quells heals alas belles lulls sauls seals quails selles follis hells valse mails nills reales mells hills filles meals pails dalles paellas bialys gaols veals tills quills bals villas hauls gals talus rouilles tailles fails hellos vails fulls hales bolls quolls hollas males coalas dells miauls pales kills fills rales culls halos vills calos sails pills bills rills balas ollas peals sills galas mills kales ghylls villus polls ballsy weals gales dales gallus mullas knolls milles hails dals foals rials salsa rails dulls zills koalas wails palsy wallas scillas dills wauls sales duals whales wills tuilles challis talas chills shales shawls tallis shells tells shoals yawls yills
fall fallow fully folly foal filly fillo fille fill felly felloe fellow fellah fella fell feal faille fail follow full valley