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.
grigs grogs garigues gregos crags groks cricks croquis cariocas
brigs rerigs prigs grigs rigs frigs trigs frags sorgos frugs teargas darics lyrics dregs grogs burgs progs bourgs rugs bergs trugs torics trogs drags drugs crags trigos sargos argus largos rags pargos virgas brags ergs cargos frogs regs shrugs
grig garigue grego grog groggy