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.
fierce feres farce force frisee frieze firs ferreous fiars fairs verse farcy fires fears frise farci viers frees fries freeze feuars fraise ferias farcie furies faeries fairies ferries ferrous foresee gheraoes pharisee
fierce terce coerce pierce tierce peres haeres terse brace farce mercy seres perse force quaeres cerci truce trace terrace feres grace farcie meres price ceres source rice verse heres orrice race trice wheres
fiery fer fir fifer vier faerie faery fair fairy fear feirie fere ferry fiar fire firry feria afire feriae fiver