Here's why:
* Captain comes from the Latin word "capitanus," meaning "chief" or "leader," which is unrelated to "capit."
* Capital comes from "capitālis," meaning "of the head" or "chief."
* Chapter comes from "capitulum," meaning "little head."
* Capitol comes from "capitolium," the name of the temple dedicated to Jupiter on the Capitoline Hill in Rome.
Let me know if you'd like to explore more Latin roots!