The Ngram Viewer will let you compare the use of multiple words or names in one chart. The example that I offer in this video is to compare making use of the terms “National Parks,” “National Forests,” and “National Forest Service.” By taking a look at the Ngram Viewer for those terms I can see that they start to appear more frequently around 1890, have a lull in the 1940s and 1950s, and after that appear more regularly once again in the 1960s..
Ngram Viewer is based upon books indexed in Google Books. That is why listed below every chart produced by Ngram Viewer you will find a list of books about each of your search terms. Those books are organized by date..
A third element of Ngram Viewer to keep in mind is that it deals with multiple languages consisting of English, French, Chinese, German, Italian, Russian, Hebrew, and Spanish..

Applications for Education.
As I discussed in the video above, the Ngram Viewer can provide an excellent way to begin a research study activity for students. Have them enter a few words then examine the graph to recognize peaks and valleys in the frequency of the words usage. Then inquire to attempt to identify what would have triggered those words to be used more or less frequently 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 released in between 1800 and 2019. The Ngram Viewer reveals users a chart highlighting the very first appearance of a word or name in literature and the frequency with which that word or name appears in literature since 1800. The Ngram Viewer will let you compare the usage of numerous words or names in one chart.

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

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