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.
harissa harass harries hearsay hears hoars hares haars hairs hearse houris haeres hoarse heiress hurries harrows herries hers heros heirs horsy hoers horas hours hires horse heres heroes hirees horahs horsey heresy heroize hoorahs hoorays hurrahs hurrays
harissa crissa briss curiosa priss prissy