Modifiers matching gradient:

• simple,
• ecological,
• environmental,
• natural,
• continuous,
• local,
• external,
• spatial,
• vertical,

Simple categories matching vertical:

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