Free R Sound Medial Words Flashcards Worksheet PDF. Printable flashcards featuring words with the medial “R” sound can be a useful tool for improving pronunciation and vocabulary. Some of the words in this flashcards worksheet are:- Carrot, Purse, Barrel, Cerel, Squirrel, Parrot, Camera, Horse, Driver, Mirror, Corn, Watermelon, Emperor, Tractor, Library, Fireman