The Ngram Viewer will let you compare the use of several words or names in one chart. The example that I give 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 regularly around 1890, have a lull in the 1940s and 1950s, and after that appear more frequently once again in the 1960s..
Ngram Viewer is based upon books indexed in Google Books. That is why listed below every chart generated by Ngram Viewer you will find a list of books about each of your search terms. Those books are set up by date..
A 3rd component of Ngram Viewer to keep in mind is that it works with multiple languages including English, French, Chinese, German, Italian, Russian, Hebrew, and Spanish..

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

Ngram Viewer is a search tool that trainees can use to check out the usage of words and names in books published in between 1800 and 2019. The Ngram Viewer reveals users a chart illustrating the 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 trainees can utilize to explore the use of words and names in books released in between 1800 and 2019. The Ngram Viewer reveals users a chart illustrating the very 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 chart is based on the books and periodicals that are indexed in Google Books.

Applications for Education.
As I discussed in the video above, the Ngram Viewer can supply an excellent way to begin a research activity for trainees. Have them go into a couple of words then analyze the graph to identify peaks and valleys in the frequency of the words usage. Ask them to try to determine what would have triggered those words to be used more or less frequently at different durations in history.