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For naming job tile or position in organizations, I found that sometimes we use plural form of noun for describing another noun. For example

Corporate Communications Supervisor

and

Corporate Communication Supervisor

I used NGram and found that Communications Supervisor is used more widely than Communication Supervisor

NGram

Is there any rule for when to make the noun ,that is describing another noun, plural or singular?

2

In your example, the person is probably responsible for more than one type or channel of communication, hence communications.

However, the practice may vary, for example Student Advisor is used not Students Advisor.

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