Modifiers matching grassland:

• wet,
• open,
• arid,
• natural,
• agricultural,
• upland,
• temperate,
• rough,

Simple categories matching open:

• sector,
• fabric,
• area,
• facility,
• space,
• thing,
• unit,
• excavation,
• surface,
• structure,
• air,
• land,
• water,
• establishment,
• business,
• procedure,
• office,
• situation,
• building,
• country,
• version,
• system,
• object,
• container,
• boat,
• network,
• wall,
• terrain,
• entity,
• passage,
• burning,
• receptacle,
• activity,
• material,
• event,
• clearing,
• market,
• marketplace,
• function,
• enclosure,
• waterway,
• environment,
• society,
• construction,
• face,
• canopy,
• issue,
• form,
• shellfish,
• highway,
• powerboat,
• service,
• aquarium,
• stairway,
• workplace,
• specification,
• patch,
• source,
• mollusc,
• territory,
• organization,
• light,
• woodland,
• watercourse,
• projection,
• collocation,
• region,
• conduit,
• design,
• pattern,
• type,
• car,
• door,
• gesture,
• protocol,
• meeting,
• part,
• sea,
• roll,
• wound,
• science,
• forum,
• vessel,
• implementation,
• document,
• curve,
• pit,
• competition,
• item,
• standard,
• lagoon,
• feature,
• site,
• grassland,
• struggle,
• file,
• article,
• forest,
• envelope,
• housing,
• beam,
• program,
• information,
• community,
• substance,
• knowledge,
• view,
• vehicle,
• nut,
• ground,
• place,
• flower,
• volume,
• appliance,
• habitat,
• image,
• flow,
• equipment,
• stage,
• field,
• cell,
• prey,
• seam,
• institution,
• application,
• conveyance,
• room,
• designer,
• basin,
• medium,
• box,
• package,
• cover,
• conflict,
• food,
• orifice,
• nester,
• code,
• group,
• liquid,
• body,
• vegetation,
• shape,
• location,
• fire,
• grain,
• section,
• fixture,
• meat,
• dish,
• ampoule,
• menu,
• resistance,
• bivalve,
• shelter,
• ocean,
• perch,
• position,
• fencing,