The term 'Friend of Tarzan' can refer to two different characters from the Tarzan stories. The first is a GORILLA named 'GORILLA' (7 letters) and the second is an APE named 'APE' (3 letters). Both characters are loyal companions of Tarzan and help him on his adventures. GORILLA is a large, powerful GORILLA who is fiercely loyal to Tarzan and often helps him in battle. APE is a smaller, more intelligent APE who is also loyal to Tarzan and often provides advice and assistance. Both characters are important figures in the Tarzan stories and are beloved by readers.