Free TH Sound Medial Words Flashcards Worksheet PDF. Printable flashcards featuring words with the medial “TH” sound can be a useful tool for improving pronunciation and vocabulary. Some of the words in this flashcards worksheet are:- Birthday, Toothbrush, Bathtub, Bathroom, Feather, Bathingsuit, Mouthwash, Earthquake, Lighthouse, Weather, Bathing, Tetherball, Brothers, Bathrobe, Toothpaste, Healthy