Occupational Outlook Handbook (OOH)
http://www.bls.gov/oco/
One may use this site to find information on a wide variety of professions, from Actuaries to Zoologists. The OOH offers a keyword (Search Box) search and an A-Z Index. You may use the A-Z Index to quickly navigate to a specific job title, but a keyword search will retrieve all records of job titles containing your keyword(s). For example, a keyword search for "Accounting" will retrieve information on the job titles of Accountants, Auditors, Financial Analysts, etc.