1) Beginning 2) Oil field assembly 3) Origin 4) Petroleum production 5) Root 6) Rootage 7) Source 8) Wellspring 9) Where a spring springs 1) Wellspring 
A wellhead is the component at the surface of an oil or gas well that provides the structural and pressure-containing interface for the drilling and production equipment. The primary purpose of a wellhead is to provide the suspension point and pressure seals for the casing strings that run from the bottom of the hole sections to the surface pressu...
• (n.) A source, spring, or fountain.
The bucket and hauling equipment at the top of the well for water. This may be quite decorative for large or religious wells.Some use the term 'Wellhead' as a description of a location or function rather than a specific item of equipment. However Anson refers to its production wellheads as simply wellheads. See also Production Wellhead. API6A says that a wellhead is all permanent equipment between the uppermost portion of the the surface casing and the tubing head adapter connection.
...the equipment installed at the surface of the wellbore. A wellhead includes such equipment as the casinghead and tubing head. adj: pertaining to the wellhead (e.g., wellhead pressure). 
Well'head` noun A source, spring, or fountain. « At the wellhead the purest streams arise.» Spenser. « Our public-school and university life is a great wellhead of new and irresponsible words.» Earle. 
[n] - the source of water for a well 2. [n] - a structure built over a well
the equipment at the surface of a well used to control the pressure; the point at which the hydrocarbons and water exit the ground
wellspring noun the source of water for a well
Refers to the topmost point of a well and the structure built over it. Wellheads include control equipment such as outlets, valves, blowout preventers, casing heads, tubing heads and `Christmas trees.`