The term servant is not usually gender specific and is a universal title. To make it gender specific for female use maid.

Yes, a specific job title is a proper noun. A job title is a common noun until it is used for a specific job. For example:

We need to hire two additional supervisors.

You will have to see Ms. Brown, the Personnel Supervisor.

You need to search for the job you are interested in. Just look up *Insert specific job title* salary. Sorry I can't do more for you, but I cannot without a more specific title.

The noun 'director' is a common gender noun, a word for a male or a female.

It depends on the specific job. There are many jobs and positions within this field of study. You would have to identify the specific job, or job title, and position.