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.
foils fils fills files fails fouls filos foals fools fowls filose follis folles fillos voiles foleys filles folios follies failles foliose fillies folious follows flus floss flues fulls vills falls fleas fells veils floes flaws fuels flews fleys feels vials flows voles viols flees vails false flies flays violas ghouls falsie phials flossy fellas floosy villas villus volleys floosie fellows fellies villose felloes fellahs floozie fallows flossie feeless villous vowless ghillies ghoulies viewless
boils foils noils reoils oils toils roils moils soils coils toiles howls kills fils bolas cowls polys polls molls bowls nils moolas mools bolus kails rills kilos voiles vills pilus voles mills fouls kolas foals moles nails tolls miles poilus cols rails louis bills hilus files nolos tails tills tools polis tolas wiles wools ceils chiles zills chills ails cholos sheols solus shills diols shools yills sills whiles bails pills vails pools dials dolls fools riles quails koels solos biles rolls ghouls rials looies holes owls hills fills filos toles lilos violas gills noels veils poles haoles mails jowls pilis piles quills nills bolos viols colas phials maills tiles kolos silos joles mailes goals coles hails boles guiles quolls bolls coals kohls polos riels gaols vials jills molas knolls pails fails cools dills dols mils pols mols sols milos fowls hols lolls jails heils oles aiolis sails wails tolus chilis tils ills wholes wills roles chiels deils soles ceilis cholas sheilas souls shiels doles shoals sials yowls
foil fil voila foully fool follow folio folia foley foal filo filly fillo fille fill file fila faille fail folly foul fowl voile