The word is a symbol, and the vocabulary of the language comes from letting the series of voices correspond to each concept of the language.
This happens when the sender intends to represent a word when the recipient attaches another word. "I need to travel" Oh, where will you go? "No, I need to take medicine."
If the sender intends to convey emotions in an indirect or metaphorical way, the recipient adds a literal meaning. (The student was absent from the class and asked if he missed something important, the teacher answered as ironically, and the students did not notice ironically.