Misc: Phonophobia is the fear of?

Questions

In a general sense, one who pleads for another in a court of law or other tribunal.?

In a uniform gravitational field, the center of gravity is also a______?

In alphabet radio code, what word is used for 'c'?

In alphabet radio code, what word is used for 'f'?

In alphabet radio code, what word is used for 'h'?