The framework of the 6 + 1 Traits Writing Model identifies six qualities of good writing.

#3 Word Choice - Word choice involves using the right words in writing that will give clarity, evoke feelings, moods, likes and dislikes, and creates a vivid picture in the readers mind. Students become aware that there are different ways to express their thoughts. They become more aware of the use and power of language by adding new and varied words within their writing. Using vivid, colorful and dynamic words will expand and enrich student writing. 

When you write, choose just the right words and use them correctly. Make them fun and interesting so they help your readers "see" what you are talking about. Try not to use the same words over and over again. If you don't choose your words carefully, your reader may not understand what you're trying to say.