Here are some examples of words derived from "demos":
* Democracy: Rule by the people.
* Demography: The study of populations.
* Epidemic: A widespread occurrence of an infectious disease in a community at a particular time. (from "epi" meaning "upon" or "on")
* Pandemic: A disease prevalent over a whole country or the world. (from "pan" meaning "all")
"Demos" is a powerful root word, reflecting the importance of the people in Greek culture and thought.