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.
filar filaree filaria filer flair flare filariae foliar filler failure flir flier flora fleer volar floor viler velar fluor flour phylar florae faller feeler feller fleury veiler flurry fouler fowler fueler fuller floury foolery fueller fullery velaria phyllary
hilar filar pilar lar liar lari foliar coiler clary jailor bailor phyllary alar molar alary flair biliary lair velar mailer glary milliare moiler mylar oiler pillar railer cellar sailer salary dollar tailor tiler tolar miler glair lear blear miliary glare gular bolar blare collar clear boiler milliary malar hailer volar viler veiler jailer nailer phylar flare filer claro bailer polar ceiler ciliary sailor solar tailer talar toiler wailer
fila fil fail faille file fill fille fillo filly filo flaw flawy flay flea foil