Modifiers matching neutral:

• small,
• energetic,
• pale,
• dark,
• soft,
• new,
• abundant,
• urban,
• warm,
• earthy,
• impartial,
• natural,

Simple categories matching earthy:

• material,
• substance,
• aroma,
• red,
• component,
• pigment,
• ingredient,
• scent,
• metal,
• neutral,
• tone,
• character,
• matter,
• veggie,
• constituent,
• elements,
• vegetable,
• stone,
• item,
• food,