The precaution I would take is make sure the word means what you are wanting it to mean. For example, you find a word in the thesaurus, but when you wrote it in let's say an essay, the word doesn't have the exact meaning. The word was instead a little off and then made the paper inaccurate. If that should happen it could confuse teachers and readers. I recommend using the dictionary after you find a word to double check. Some words are quite easy to understand the meaning,but if you want an elevated word choice watch out for confusing definitions.
Sorry if this is not enough words. The subject can't really be expanded farther.
