A public speaker
The word specialty is a noun. It is something in which someone specializes.
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It is a proper noun, as it is the name of someone.
The doctor specializing in root canals is an Endodontist.
A blood doctor is a hematologist, usually someone is both a hematologist and an oncologist (cancer doctor)
Someone who specializes in firearms
someone who specializes in economics :)
Only if you are reffering to someone elses speech but if it is your own then no.
An astronomer who specializes in studying the sun is called a solar astronomer.
You could say there were prolix or a circumlocutor!
You take it to someone who specializes in them.
You hire an investigator who specializes in that type of research.You hire an investigator who specializes in that type of research.You hire an investigator who specializes in that type of research.You hire an investigator who specializes in that type of research.