People judge you by the words you use
Like it or not, every time you speak to someone they are trying to figure out how competent, successful, and smart you are.
Research has shown that people are more likely to be judged as competent and smart when they speak with a good vocabulary.
Language and thought are inseparable
You need words to think and to think you need words. If you don’t believe me, try to come up with a solution to a problem without thinking in words. You can’t – it’s
just plain impossible. Language is the tool our minds use to think, plan, solve problems, and succeed.
Therefore, it follows that knowing more words gives your mind more ways to think about things and more tools to plan and solve problems. Having a better vocabulary literally improves your ability to think.