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.
hereto hereat heart hearty heired heriot herried hart herd hurt hared heard hired hairdo haired
hereto whereto ret uredo arete whereat turret treat terete surety greet garret cruet caret rato redo rete roto barret tret beret burrito ferret ferrety foredo fret hereat credo curet great quarto teredo terret buret
here her hare hear heir hero herry hire hiree hoer