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.
great grat groat greet grate garret create grot grad grit grout griot garda krait carat karat curet korat greed grade gored kraut caret crate cruet gride curate gourde gardai garote gritty grotto karate grouty carate garred grotty greedy garrote curette garotte garrotte cart cred crit curt grid kart
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
gore gray gree grew grey grue agree ogre recarry wreaker