Englishfor English speakers
correspondence
Noun
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If two people are in correspondence, they are in a friendly discussion.
My brother and I have been in correspondence over what to do for my elderly father.
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A correspondence is a written communication (such as letters) between different people
My brother sends me a correspondence every day about my father's health.
principle
Noun
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Principles are personal rules that tell you what is right and wrong.
It goes against my principles to ignore her.
One principle I follow is not to have regret.
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A principle is the general idea that explains or supports something.
The basic principle of his chair is that the knees should be below the hips.
Police must not accept money because it could affect their judgement. The same principle applies if gifts, etc, are offered.