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.
fils foils fails fills filos files filose filles fillos flus fillies failles fleys flees fuels floes vails falls fleas flows flews veils fouls vills feels floss vials flues viols fells fulls foals fowls fools flays flies false flaws folles foleys folios falsie violas voiles floosy fellas villus follis phials flossy villas fellies follows foliose villose fallows feeless villous follies fellows felloes folious fellahs ghillies viewless vales valse veals voles
ails heils toils tails soils ceils reoils pails noils nails mils mails quails kails coils jails hails bails veils vails foils fils fails boils moils nils oils rails roils sails deils tils wails
fil fila file fill fille fillo filly filo