Serac, which refers to a sharp ridge or pinnacle of ice protruding from a glacier, is often used in mountaineering and glaciology. While there are no exact synonyms for this word, some similar terms include icefall, crevasse, and glacier tower. An icefall is a dangerous area on a glacier where ice breaks into numerous jagged pieces creating a chaotic terrain. A crevasse, on the other hand, is a deep crack or fissure in a glacier, often resulting from tension within the ice. Lastly, glacier tower refers to a tall, conical peak of ice that forms due to differential melting and freezing of the glacier. All in all, these words describe natural formations of ice that can be equally awe-inspiring and perilous.