Englishfor English speakers
principal
Adjective
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The principal thing is the main or most important one.
Canada's principal trading partner is the USA.
Presumably most of us work for the same principal reason - in order to live.
principal
Noun
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In American English, a principal is the head of a school. (=headmaster in British English)
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The principal is the most important person in a business, or an artistic group such as a dancers.
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Principal is the money that you borrow and must pay back. It does not include interest.
crew
Noun
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A group of people working together to operate something such as a ship, factory, airplane, etc.