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.
hereat hereto heart hearty heired heriot herried hart herd hurt hared heard hired haired
hereat whereat treat great ret rat curet carate read drat ferret cruet tread beret phorate rato rete ferrety reata aurate aureate irate lariat prat crate barret cirrate groat turret treaty rate terret hydrate ferrate reread krait karate errata lyrate arete orate buret jurat fret garret berate frat heart aerate bread curate pirate deaerate laureate create grate gyrate carat caret hereto brat derat surety peart dread serrate cerate prate oread derate borate kraut narrate korat karat greet terete trait grat tret urate whereto
here her hare hear heir hero herry hire hiree hoer