köken: Borrowed from French gazon, from Middle French gazon, from Old French gason, wason (“piece of ground covered with grass, turf”), from Frankish *waso (“ground, turf”), from Proto-Germanic *wasô, *waisǭ (“moisture; ground”).
pasture (an open field covered with grass, used or suitable for the grazing of livestock) · lawn, turf (a maintained grassy area, a competition field, on which sports matches are usually held) · grass (in pastures, meadows, roadsides)
köken: From vireō (“to be green, verdant”) + -tum (suffix forming nouns for stands of vegetation). The -c- would be inserted by analogy to forms like frutectum (“thicket, bush”), cārectum (“reed bed”) that are derived from noun stems ending in /k/.