Modifiers matching ground:

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

Simple categories matching vertical:

• arena,
• break,
• formation,
• surface,
• market,
• pillar,
• component,
• improvement,
• artifact,
• control,
• object,
• structure,
• gradient,
• support,
• restraint,
• articulation,
• application,
• sign,
• form,
• column,
• position,
• installation,
• upright,
• excavation,
• format,
• dimension,
• representation,
• industry,
• feature,
• sector,
• passageway,
• transport,
• obstruction,
• infrastructure,
• pipe,
• picture,
• process,
• part,
• datum,
• plane,
• length,
• force,
• movement,
• distribution,
• direction,
• load,
• hierarchy,
• domain,
• opening,
• device,
• panel,
• property,
• loading,
• website,
• strand,
• terms,
• member,
• level,
• institution,
• boundary,
• interval,
• steps,
• topic,
• drain,
• thing,
• subject,
• substrate,
• marker,
• edge,
• obstacle,
• wall,
• furnishing,
• passage,
• relationship,
• engine,
• medium,
• field,
• section,
• content,
• measure,
• activity,
• route,
• area,
• artefact,
• image,
• door,
• attribute,
• construction,
• search,
• barrier,
• cylinder,
• post,
• space,
• system,
• business,
• solution,
• biped,
• function,
• standard,
• result,
• enterprise,
• organization,
• siding,
• service,
• distance,
• pole,
• unit,
• line,
• extent,
• shape,
• margin,
• drainage,
• mall,
• access,
• ground,
• item,
• shaft,
• information,