An objective provides a focus for your resume. For advertised jobs, you can use the exact job title of the job that is of interest. When sending a resume and cover letter to discover jobs in the “hidden” job market, you can use a job title most applicable to the type of opening you are pursuing.
A resource for finding applicable job titles is the ONET. Search by keywords to find the type of job you are focused on. For example, Human Resource Specialist lists sample reported job titles of Corporate Recruiter, Employment Representative, HR Analyst (Human Resources Analyst), HR Coordinator (Human Resources Coordinator), HR Generalist (Human Resources Generalist), Human Resources Representative (HR Rep), Human Resources Specialist (HR Specialist), and Personnel Analyst, Personnel Officer.
Here is a one-page example of a chronological resume with a simple objective: