It's an interesting tool. The Google NGram Viewer can do much the same thing, and it's nice to see that the graphs do match up. https://books.google.com/ngram

It's an interesting tool. The Google NGram Viewer can do much the same thing, and it's nice to see that the graphs do match up. https://books.google.com/ngrams/graph?content=Great+War%2CWorld+War+I&year_start=1800&year_end=2000&corpus=15&smoothing=3&share=&direct_url=t1%3B%2CGreat%20War%3B%2Cc0%3B.t1%3B%2CWorld%20War%20I%3B%2Cc0 https://books.google.com/ngrams/graph?content=Great+War%2CWo...