If your vocabulary is limited, nuance goes out the window.
It’s not only about using professional jargon (every industry, trade and occupation has its own); because sometimes we need to simplify it to be understood and sometimes we need to amplify it to show expertise.
But it’s also about being able to use the right word in the right moment. The right words give you the opportunity to express your manners, attitude, professionalism, empathy, courtesy…
Your vocabulary reflects the way you think! When you have the right vocabulary your ability to see, to explain and to influence becomes exponential.