Category Nuances for gray:

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

Simple Categories for gray:

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