Answer: define, influence, reflect, describe.
Language is the method in which humans communicate, but it is also the system that allows us to process reality. Language can help us define the things we see by creating categories and qualities that things have or not have. It can also influence when being used to persuade, educate or indoctrinate people. Language reflects experience, as we name the things we see and feel. Finally, language can describe, in order to make our experience clearer or richer.