What is a root word?

Answer:
A root word means the main word from which other words can be formed.
For eg:
☆From the word "exaggerate" you can create
▪︎overexaggerate
(remember over is prefix here)
▪︎overexaggeration
(over is prefix and ion is suffix)
So the root word here is exaggerate.
☆From the word "agree" you can create
▪︎disagree
(remember dis is prefix here)
▪︎disagreement
(dis is prefix and ment is suffix)
So the root word here is agree.
That means the root word is the word without any prefix and suffix.
Hope you got the concept!