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.
fires firs fairies fares froes feres vires frees fores fries fairs fiars furies fierce vireos faeries ferries foresee furs foresaw ferreous viers furze farce frise fears vairs force fours frass faros virus frays froze frows frieze ferias frowsy frisee farcie freeze fraise forays varies feuars veeries farrows furioso furrows furious ferrous phoresy gharries gheraoes friz vars
vires fires sires wires cires mires tires ires zaires hires moires quires shires res bores lories mirs birse gharries quaeres heresy guiros marries hares cries quarries wries reis greys mares rees liars ares lyres prese pares piers peres vireos curries barres kirs eyries juries giros kiers brews pareos meres keirs herries seeress cress peeries virus sores viers dories surreys lorries tarres tiers drees jerries boreas birrs vairs lores gyres duress seres mores pries wearies whereas dries whirrs carries whores worries tiros ores chares chiros derries chirrs choirs chores tres sherries tares tries shores yirrs tyres press kauries kyries rues crews fares curies firs nairus wairs heres liers cores tarries aeries trews larees fries sauries heirs bries presa wherries sirs deairs airs tories pairs brees feres fairies lairs noirs faeries soirees parries mbiras dowries dairies preys phoresy fores aures frees rares mures grees cowries tores ceres lures furies heiress hairs paries caries liras coirs heroes haeres perries berries fairs harries eyres roes buries bares veeries terries cures gores cereus aureus pores biers grues byres queries lares corries fiars sirrees pyres areas murres cares serries pareus murreys caress murries braes nereis wares diaries peeress kerries treys nairas ferries mairs froes hurries varies iris sirees dares gurries biros nares hirees trees dures cherries sarees ureas prees series weirs wheres whirries durries whirs dearies dress chairs trues zeroes chirres bourrees chirus choreas shares purees shiers tress shirrs shrews yores
fire fir fifer fair fairy fare feirie fere fiar firry fiery fore frae free froe vireo afire fiver