Is a principal a man of principles?
Some words can be used either as nouns or as adjectives.
Principal is a noun when it refers to:
A sum of money: He gets a good interest on his principal.
The leader of a school: The principal dismissed the head of the English Department.
It is an adjective when it is used as a modifier meaning main, leading, first in rank: the principal subject for debate was the question of peace or war.
But the word principle should never be used as an adjective. It is always a noun.
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