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.
frags frigs frogs frugs fracas freaks farragoes viragos forgoes foregoes viragoes forks fricassee frocks virgas phreaks verrucas
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
frag forgo freak freaky frig frog froggy frug