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.
cred creed cried credo cured cored cared curred caried card cord crud curd carried curried crowd caret curet crude greed gored carte crate curdy caird cruet create crowdy croute curite garred greedy cardio corody curate quired cardia cruddy carate corrida cowrite corrody corrode queried corrade crowdie curette cowrote queered cardiae cart curt quarried grid crit grad gourd grade grate great greet carat gride grody guard garda court
red sered cered marred purred chared bored jeered ired tyred paired bred parred bared birred garred soared cored moored neared burred gnarred sheared cured aired shred shirred churred cheered wired wared tired reared haired choired pored heired whirred teared barred soured queered deaired loured tared gyred laired seared pared mured erred knarred mired cared sired curred feared furred faired cred oared toured hired jarred fared chaired poured lured roared shared eared quired hared geared dured leered dared gored sored fired tarred warred peered shored chirred veered rared tiered waired whored charred chored sheered yirred