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.
heiress hires heres heirs heroes heresy haeres hirees hers herries hears hoers hares heros hairs hearse harass harissa hearsay harries heroize hurries hours horsy horas hoars haars horahs houris harrows hoorahs hoorays hurrahs hurrays
heiress ires chirres tressy tires dressy dairies soirees sirees cires peeress fairies fires vireos vires hirees hires caress sires wires tress duress dress zaires seeress cress press moires mires quires cuirass cressy shires res