The land was a brown-field site
The word "field" applies to open land, and the verb "to field" applies to sports teams or activities.
Control of the diamond field is usually maintained by the title holder to the land.
Open field warfare the land where two sides meet for war and fight.
Le Bourget Field
Open field warfare the land where two sides meet for war and fight.
Le Borget
I understood brown field projects to be land that had previously been used for other buildings, i.e. factories, warehousing or even ex NHS or MOD land
Often an acre of land is compared to a football field. In reality, an acre is equal to about 76% of a football field, when you consider both end zones.
As far as rules are concerned, punting and field goals have the same rules (except punting cannot score points like field goals can). They are referred to as 'scrimmage kicks'. So a FG that will land in the field of play is identical to a punt that will land in the field of play. The kick returner can even call a fair catch!
They land at a place called AERODROME, AIRFIELD, AIRPORT, LANDING FIELD, RUNWAY...
Not very much. "Plain" emphasises that the land is flat and level - not a hill or a valley. "Field" emphasises that the land has a boundary and belongs to some person who presumably cultivates it.