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.
redear retear reader redder readier reedier redry rider ruder radar ridder raider rudery redraw rudder redrew reutter rater retry retro router rotary ratter ritter retore rotter rooter rioter retire writer rattier retiree rootier rowdier ruddier ruttier
dear redear feodary bawdier bedder gadder loader heder beadier codder fodder radar moodier lauder leadier cider gaudier needer hider rowdier header fader nodder bider adder reader deer guider odder aider giddier rudery beader wheatear shudder shedder wader shader chuddar sadder chider cheddary cedary chadar wider deedier seeder eider weeder reedier udder ruddier doddery tedder badder deodara muddier sudary redder ridder madder powder lidar teary leader nuder kidder voider kneader feudary budder faddier needier deary rider tear deair ceder lieder heeder feeder midair lader headier readier bidder lewder doer powdery gaudery dare gaydar louder ruder padder judder raider retear dere seedier mudder deodar hoodier dowdier dodder rudder tidier ladder wedder seder coder deader widder woodier cedar cheddar cheder cyder chowder chudder wadder shadier shoddier weedier shuddery
rede red redia redd ready readd read rued freed brede cred creed greedy preed dreed uredia rediae reed redo reedy rete ride rode rodeo rude bred breed ired credo greed greet reread treed uredo