Example1:
My father works as a principal.
Meaning:
A person who is in charge of a school.
Form: Noun
Example 2:
Breakfast is my principal mean during the day.
Meaning:
Fundamental, necessary, crucial …
Form: adjective
B. PRINCIPLE:
Example:
I do respect her because she is a woman of principles.
Meaning:
Value, idea, belief …
Form: noun