The work of a Domain expert

The Reign of Domain Expert
I have come across friends calling themselves domain expert. But i got to ask this question who is a domain expert and a domain researcher.
Many people know the meaning of Domain name. A domain name is the name given to a website and a domain expert is a person that analyze the domain name given to a website if the domain name is appropriate for the website.

A domain researcher is a person that search for the appropriate domain name for a website.

Where can one hire a domain researcher?
Freelancing website is our number one best bet. for example fiverr
just at for $5 you can hire a domain researcher for your website name research.