turf - noun
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\ ˈtərf \
plural turfs\ ˈtərfs \ also turves\ ˈtərvz \
1a: the upper stratum of soil bound by grass and plant roots into a thick mat
also : a piece of this
b: an artificial substitute for this (as on a playing field)
c: grass
According to this definition, and since very few football fields are just dirt, all fields have turf, some artificial, some natural