Hypsographic refers to the measurement and description of features or phenomena relating to land elevation, such as mountains, valleys, and plateaus. Some possible synonyms for this term might include topographic, altimetric, or elevation. Other related words could include geographic, cartographic, or geodetic, which also pertain to mapping and describing physical features of the earth. In scientific or academic contexts, terms like geomorphological, orographic, or terrain-related might also be used to describe features of land elevation and shape. Ultimately, the choice of synonym may depend on the specific context and purpose of the discussion or analysis.