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.
treat treaty tret trait tread turret terete terret tort trot tart trad drat trade trite trued tarot trode derat trout tared tried torta torte tired torot tyred triad tarty treed dread teredo tiered derate toured tirade triode teared territ trouty tarred hydrate tarried deaerate trod turd
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
tare tray stray straw readier reader tyre true trey tree tore tear torah tora tire terai teary strawy strew