So there doesn't seem to be a way of looking up a specific word, not highlighting a word in a novel, merely looking up the word. (epubor.com)
One nice touch is that as the text is read, the software highlights the words as they are spoken, which could be useful for learning a language or expanding one's vocabulary. (pcworld.com)
You can do this in word by highlighting the word or words you need to adjust. (madgeniusclub.com)