american
background
ball
board
championship
civil engineer
court
dimensions
down
end zone
field
first
first down
football
game
goal
grass
green
hash marks
horizontal
lawn
layout
line
marks
match
material
object
pattern
pitch
play
playground
point
scrimmage
sidelines
sport
stadium
standard
surface
tactic
team
textured
top view
touchdown
turf
yard
yard line
yardage