Even words that have been in use for many years aren’t necessarily used correctly in speech or in writing. Use a dictionary, thesaurus, or dictionary.com to look up a word if you are not sure of its true meaning.
Don’t use vocabulary that is over your head, your reader’s head, or that doesn’t really relate what you want to say. Make sure you understand the words you write.
Don’t use a fancy word to impress because if it’s wrong, you’ll do just the opposite!