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.
dregs drugs drags dreks drakes drecks drogues darkies darkeys druggies trugs trogs trigs darks treks dorks dirks darics drouks durocs tragus trigos trikes trokes teargas torques turkeys derricks
regs dregs brigs burgs burkes ergs frags frigs brags virgas frogs grigs largos prigs bourgs drugs treks trogs choregus crags rags rerigs pargos rugs rigs recs frugs cargos gregos argus grogs progs sargos drags bergs sorgos dreks teargas trigs trugs shrugs
dreg dreggy drag draggy dreck drecky drek drogue drug druggie druggy