The Ngram Viewer will let you compare using several words or names in one graph. The example that I give in this video is to compare using the terms “National Parks,” “National Forests,” and “National Forest Service.” By looking at the Ngram Viewer for those terms I can see that they start to appear more regularly around 1890, have a lull in the 1940s and 1950s, and then appear more frequently again in the 1960s..
Ngram Viewer is based on books indexed in Google Books. That is why listed below every graph generated by Ngram Viewer you will discover a list of books about each of your search terms. Those books are set up by date..
A 3rd element of Ngram Viewer to keep in mind is that it deals with several languages consisting of English, French, Chinese, German, Italian, Russian, Hebrew, and Spanish..

Googles.
Ngram Viewer is a search tool that students can utilize to check out the usage of words and names in books published in between 1800 and 2019. The Ngram Viewer shows users a chart showing the very first look of a word or name in literature and the frequency with which that word or name appears in literature because 1800. The graph is based upon the books and regulars that are indexed in Google Books.

By the way, the book that I pointed out in the video is That Wild Country by Mark Kenyon..

Applications for Education.
As I discussed in the video above, the Ngram Viewer can offer a good way to begin a research study activity for trainees. Have them get in a couple of words then take a look at the graph to identify peaks and valleys in the frequency of the words use. Then ask to try to determine what would have triggered those words to be used more or less often at different durations in history.

Ngram Viewer is a search tool that students can utilize to check out the use of words and names in books published in between 1800 and 2019. The Ngram Viewer shows users a graph highlighting the very first appearance of a word or name in literature and the frequency with which that word or name appears in literature given that 1800. The Ngram Viewer will let you compare the use of numerous words or names in one graph.