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.
cocoas cocas cocos cacas cocks cooks cuckoos cookies cookeys cogs coxa coax cokes kooks cocci gogos coxae cakes gooks cacaos caucus guacos caiques quokkas cox
cocoas cos coys goas koas biogas boocoos buckos cows ficoes fucous geckos jocose cosy cogs locos guacos mucose oaks okas picas cycas sequoias soaks decays decoys tacos wackos chicas shackos yogas micas casa cacaos locoes cays caws case fucose hookas jockos coos jucos cacas cocas coss coax cocos coxa macaws mucosa mucous ocas pacas raucous scows sickos socas decos dioicous togas whackos chicos showcase yucas
coco cocoa coca cock cocky coocoo cook cookey cookie cooky acock rococo