The term 'Island West of Mull' refers to two islands located off the west coast of Scotland. The first island is Staffa, which is a 6-letter word. It is a small uninhabited island in the Inner Hebrides, known for its basalt columns and sea caves. The second island is Iona, which is a 4-letter word. It is a small island in the Inner Hebrides, known for its religious significance as the site of an ancient monastery founded by St. Columba in the 6th century.