WordNet (r) 3.0 (2006):

collective farm
    n 1: a farm operated collectively

Moby Thesaurus II by Grady Ward, 1.0:

66 Moby Thesaurus words for "collective farm":
   arable land, barnyard, barton, cattle ranch, chicken farm,
   collectivism, collectivity, collegiality, common ownership,
   communal effort, communion, communism, community, cooperation,
   cooperative society, cotton plantation, croft, dairy farm, demesne,
   demesne farm, democracy, dry farm, dude ranch, factory farm,
   fallow, farm, farmery, farmhold, farmland, farmplace, farmstead,
   farmyard, fruit farm, fur farm, grain farm, grange, grassland,
   hacienda, homecroft, homefarm, homestead, kibbutz, kolkhoz,
   location, mains, manor farm, orchard, pasture, pen, plantation,
   poultry farm, profit sharing, public ownership, ranch, rancheria,
   rancho, sharecropping, sheep farm, socialism, state ownership,
   station, steading, stock farm, toft, town meeting, truck farm