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.
credo cred cored cured creed cried cared caried cardio curred carried curd card cord curried crud cruet curet caret crowd caird gored curdy crate carte crude greed carate curate crowdy create carrot greedy cardia corody cruddy quired garred curite croute carroty queried corrody cowrote corrida curette corrade cowrite corrode cardiae queered crowdie quarried cart crit curt grad grid grot
redo uredo credo teredo foredo red freed erred veered teared read harried queered bared garred reed brede geared jereed carried aired lured hereto queried caried faired greed barred reread quired jeered jerreed curred treed sired mured whereto wried serried married neared rared nereid parried eared whirred wared wearied worried chared tardo cheered sored choired rued churred sheared toured shirred trued shred tiaraed tarred whored fordo gnarred buried pureed cardio zeroed ired dread rede fared tiered ferried cried cored cered fried leered moored varied seared bread soured marred feared gyred purred bred jarred cred bored haired tread hired wherried cured pared laired oared cared breed mired oread herried quarried hairdo loured creed curried juried burred heired knarred redd pored furred dried deaired sered preed gored hurried roared peered poured waired tyred hared dorado dared paired soared pried birred dreed reared berried fired ordo tarried wired tared parred warred weirdo chaired charred dured chirred tired whirried chored shared sheered aeried shored tried shrewd yirred
care core crew cure acre ocrea ocreae scree screw screwy