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.
nuder neuter nutter nodder needer nuttier needier kneader nadir niter noter nitery neater natter netter nutria nature knotter nattier nettier niterie nittier knitter gnattier knottier
lauder nuder ruder louder ceder wader loader leader couter doddery aider cuter adder seder fader dere kidder lewder shadier fodder nodder widder redear header tidier readier giddier sudor needier budder badder shudder router chudder woodier weeder udder tauter deedier seedier cyder gadder raider mudder shoddier madder ridder rudder mudra feeder heder codder doer kneader odder padder powder dear chider hider moodier rowdier eider deader pouter neuter touter powdery bider wider guider bidder shedder reedier cider lader reader heeder beadier voider bedder faddier outer coder gaudery ladder judder leadier gaudier wedder chowder needer muter muddier hoodier beader rider bawdier deer seeder dowdier redder shouter ruddier headier lieder rudery sadder souter dodder tedder wadder weedier cheder shader shuddery
nude nide node nudie unde undee