Be aware of the vocabs!

Why should be aware of them? Vocab is one that integrated in every expression spoken or written in your communication tools. Right word would give better understanding. So, one doesn't need many words to say one thing through the right choice of words or one can put others at ease by using the right words in commenting or giving order. Let's compare: "You must change your clothes now. Find the brown one."  with this: "You'd better change it with the brown one, it looks good on you." Or, "I enjoy it", instead of "It gives me much excitement."

It's just a simple sample, I am sure you can find other and more samples that used in your daily communication.