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.
gript griped gripped crept crypt carpet crypto groped corrupt grouped groupoid
dript gript rapt wrapt bewrapt erupt irrupt carpet corrupt crept crypt periapt rewrapt dropt trapt
grip gripe gripey grippe grippy gripy cripe gorp grape grapey grappa grapy grope