Words could be used to enhance and lift up a person's spirit, or used for possible depletion. A common core practice in Feng Shui is to always be mindful of what you think and speak.
From a feng shui perspective, words could be absorbed into the walls of your environment, aiding to either supportive energy or “Sha energy” (draining energy).
Take a biology analogy and bring it into context when speaking about feng shui for your home. Our skin is one of the largest organs that covers our body. The walls of your home do the same and give you protection while also absorbing the environment around it. This also includes word and thought vibrations. It’s believed walls of a home will also absorb the energy of the occupants within that space (also called "predecessor energy"). This is why it’s suggested to have a space clearing after moving into a new home or apartment.
Bottom line, due your best to always speak and think mindfully about yourself and others. The walls are listening.