Full mouth:combination of bite wing and periapical x-rays to show a complete survey of the teeth and bones.
Full mouth set of left, right and frontal x-rays.

As the name suggests a Panoramic X-ray makes a complete half circle from ear to ear to produce a complete two dimensional representation of all your teeth to give an overall picture of your teeth and jaw bones.
This is a large,single x-ray film that shows the entire bony structure of the teeth and face.

http://www.doctorspiller.com/Dental _X-Rays.htm

Full Mouth Series: This is needed to find conditions such as cysts, tumors, gum disease or abscesses that exist in the bone surrounding the teeth. It is used to determine the health of the teeth and the nerve tissue within the teeth, and can be employed as a comparison for the future if any problems should arise.

Panoramic X-ray: Is one X-ray that provides a full picture of your whole mouth- complete upper and lower jaw; sinuses and jaw joint. It is not as specific as the other X-rays because its purpose is to show the general condition of all the teeth. It is used to help view- general tooth development; trauma; jaw joint pain; wisdom teeth and certain abnormalities. It will give a broad view but does not provide the fine detail that Bite-Wings or P.A.s provide.

http://www.dentalgentlecare.com/necessary_x-rays.htm#Full Mo...

Full mouth> Periapical X Rays> Full Details of dental tissues, hard and soft, used for endodontics, peirodoncy, prosthetics and requiered by law.
Panorex, wide R ray, showing a nondetailed view of mouth and its adjacent structures. Most used in oral surgery and mainky for Orthodontic treatment in USA and SouthAmerica