First, by using precise and specific language, Lewis was able to convey a more accurate and comprehensive picture of the places and experiences he encountered on his expedition. This helped to provide a better understanding of the natural and cultural features of the regions he explored, and to document the expedition's discoveries and observations.
Second, by using standard and widely-recognized terms, Lewis was able to communicate more effectively with his readers and with other members of the expedition. This allowed for more precise and efficient communication, and helped to ensure that everyone had a shared understanding of the places and experiences being described.
Third, by using informative terms, Lewis was able to create a more useful and lasting record of the expedition. His journals provide an important source of information for historians and researchers, and the use of clear and precise language makes these records more valuable and accessible.