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.
karn carn kern kirn kerne cairn krone carny kroon korun garni carnie carina garron krooni careen cairny carney koruny guarani carinae guarana carrion gran curn grin corn green groan crown krona croon grown corny grain groin cornu grana crone crony crane quern
barn earn carn karn learn reearn darn tarn warn sharn yarn yearn