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.
greed greedy greet gored creed garred grid cred grad credo grate guard garda cured gride cored great gourd grade cared cried grody gourde create caried garote garret curred quired gardai curette carried queried curried queered garrote garotte garrotte quarried card cord crud curd grat grit grot
reed pureed creed dreed breed greed freed treed preed jerreed jereed red gored leered erred queered feared quired cred eared hurried greet fared poured married pored sered garred jarred arete greedy bred soared pardee heired peered read pried fried zeroed uredo reread oared queried dread reedy cured bored chared toured buried trued wared cheered teredo whored choired worried churred sheared tarried shirred tiered shred tiaraed dared wearied ferried tared nereid burred lured jeered cored marred dried whirred bared roared serried varied furred curried soured reared sired curred haired tread mured sored fired pared oread cried credo faired parred waired neared redd rete aeried carried herried knarred juried aired geared hared caried gyred hired wried ired brede loured quarried rued barred foredo berried purred laired charred seared veered gnarred harried moored redo cered dured paired birred rared mired bread cared rede parried whirried wherried chaired deaired tried tyred warred chirred teared wired tired chored shared sheered tarred shored terete shrewd yirred
gree gore grew grey grue agree geekier ogre reeker reekier