Here's why:
* Root words are the basic, core units of meaning in a word. They stand alone and cannot be broken down further. Examples include "graph" (writing), "port" (carry), "ject" (throw).
* Suffixes are added to the end of a word to change its meaning or grammatical function. "-ment" is a suffix that often indicates a state, action, or result.
For example, in the word "document," the root word is "docu" (meaning "to teach, to prove"), and the suffix "-ment" indicates the result or action of "teaching" or "proving."