Modifiers matching ground:

• working,
• soft,
• neutral,
• dangerous,
• paved,
• hard,
• high,
• metal,
• mechanical,
• uncultivated,
• rough,
• unsecured,
• rigid,
• conductive,
• good,
• moist,
• slippery,
• hazardous,
• firm,
• difficult,
• open,
• routine,
• sacred,
• flat,
• low,
• clear,
• sandy,
• safe,
• electrical,
• level,
• uneven,
• weak,
• barren,
• grown,
• waterlogged,
• unstable,
• softer,
• harder,
• white,
• coarse,
• higher,
• disturbed,
• holy,
• loose,
• old,
• clean,
• common,
• private,
• over,
• bad,
• artificial,
• undisturbed,
• natural,
• metallic,
• irregular,
• stable,
• sensitive,
• familiar,
• under,
• elevated,
• vertical,
• permeable,
• porous,
• new,
• off,
• woven,
• technical,
• dry,
• convenient,
• shiny,
• up,
• heavy,
• sized,
• rocky,
• wet,
• durable,
• particular,

Simple categories matching convenient:

• location,
• transportation,
• product,
• facility,
• oxidant,
• surface,
• access,
• material,
• place,
• container,
• shop,
• medium,
• content,
• point,
• shape,
• function,
• element,
• unit,
• article,
• supply,
• population,
• transport,
• circuitry,
• group,
• vegetable,
• building,
• food,
• means,
• liquid,
• time,
• item,
• origin,
• power,
• object,
• property,
• option,
• site,
• stuff,
• toy,
• length,
• position,
• carrier,
• part,
• lubricant,
• receptacle,
• times,
• structure,
• substrate,
• meal,
• store,
• ground,
• metal,
• form,
• area,
• landmark,
• height,
• size,
• appliance,
• fuel,
• plastic,
• source,
• thing,
• interval,
• boundary,
• energy,
• hours,
• outlet,
• support,
• feature,
• format,
• tool,
• telephone,
• insulator,
• activity,
• way,
• connector,
• applicator,
• system,
• messaging,
• service,
• accessory,
• hardware,
• computer,
• construction,
• dispenser,
• device,
• spot,
• equipment,
• measure,
• installation,
• contraceptive,
• extra,
• hour,
• instrument,
• gas,
• order,
• tissue,