What is the Root word of spell?

The root word of "spell" is spell, which is of Old English origin. It's a noun that means "a spoken word or phrase believed to have magical power."

However, if you are looking for the *etymological root* (the origin of the word), it comes from the Proto-Germanic word *spellijaną, meaning "to speak."

So, while "spell" is itself the root word for various words like "spelling" and "misspell," its ultimate origin lies in the concept of speaking.