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.
careen carn green cairn carny cairny greeny carnie carina carney carrion greenie carinae coreign karn corn curn corny crone crony crane crown cornu garni croon crania cranny curran garron coronae guarana guarani
boreen careen treen preen moreen green terreen tureen rein pereon greeny siren warren hereon serein terrene whereon barren arene herein bren murein wherein frena serene pyrene arena wren gyrene syren chirren
care car screw scary carr carry core crew cure acari acre agree ocrea ocreae scar scare scarey scarry scree screwy