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.
crags crakes creaks croaks cargos cracks carcass cargoes caracks carcase carracks cariocas curacoas curacaos corks grogs carks crocs grigs creeks cricks crocks crocus crooks crucks gregos croquis garigues karaokes crux
rags brags crags drags frags bergs progs parkas frogs orcas rigs largos frigs burkas virgas ragas cargos regs viragos sorgos dregs teargas trigs trugs choragus rugs burgs frugs raggs rerigs prigs pargos araks markas grogs ergs barcas grigs argus sargos seracs brigs bourgs burqas drugs tragus trogs charkas shrugs
crag craggy carack cargo crack cracky crake creak creaky croak croaky curacao curacoa scrag scraggy