Category Nuances for gray:

• dark,
• neutral,
• solid,
• local,
• natural,
• soft,
• upland,
• basic,
• base,
• pale,
• light,
• wild,
• darker,
• alien,
• single,
• unusual,
• pastel,
• common,
• riparian,
• traditional,
• evil,
• unfamiliar,
• migratory,
• native,
• larger,
• several,
• lighter,
• mutagenic,
• distinct,
• standard,
• marine,
• large,
• sensitive,
• colored,
• insectivorous,
• uniform,
• muted,
• polished,
• new,
• opaque,
• working,

Simple Categories for gray:

• predator,
• color,
• attribute,
• animal,
• system,
• fabric,
• carnivore,
• dress,
• tint,
• institution,
• creature,
• beast,
• neutral,
• mammal,
• style,
• race,
• surface,
• agent,
• force,
• coating,
• bird,
• shade,
• object,
• horse,
• group,
• entity,