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.
grogs grigs groks gregos garigues crocs crags crocks crooks crocus croaks cargos cargoes croquis cariocas curacaos curacoas karaokes
frogs trogs progs grogs prigs crocs dregs sorgos rerigs largos rocs argus rugs trugs bergs crags virgas groks durocs taroks trigs grigs regs narcos frigs cargos drugs drags pargos sargos rags frags rigs ergs frugs teargas burgs brigs bourgs brags tarocs shrugs