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.
rudery ruder rudder ruddier rider retry redry redear redder reader router raider ridder readier ruttier reedier rowdier reutter retro rater radar rooter retear redraw redrew ritter retire rotter ratter rotary rioter retore writer rattier retiree rootier
powdery gaudery shuddery rudery doddery dry lader dray giddier beadier ruddier fodder odder deer battery cautery bidder pottery fader adder rudder bider dear bawdry nitery reedier cider readier buttery redry guttery needer leadier kidder guider gaudier seeder deader reader shudder shedder shader chowder cheder chattery wider weedier wedder wader udder tidier tawdry derry padder eider sudary moodier muddier sadder judder terry cedary rider littery deedier dory lewder nuder coder mattery deray powder deary hider kneader nodder ladder hoodier beader lottery heeder teary header doer bootery retry mudder madder dodder budder bedder aider dere redder jittery feeder faddier feodary voider heder raider ruder feudary eatery leader bawdier badder lauder needier cyder ceder louder seder codder rowdier poetry cattery gadder lieder loader tottery headier watery redear weeder widder seedier woodier cheddary dowdier chider chudder tedder shadier shoddier wadder ridder
rude rede ride rode rodeo rudd ruddy rued crud cruddy crude cruet prude trued