MS Word autocomplete like notepad++ or MS Excel

Question

I'm writing a big document in Microsoft Word 2013, and there are many common words. So I have to retype many words again and again. I know that there is a way to add words to the AutoComplete list but it's boring to add every word in that list. Is there any better way to suggest words from inside a document while you type (automatically, without any additional work)? Just like Notepad++ suggestions when you start to type something that exists in the document.