Modifiers matching earth:

• fluid,
• surrounding,
• red,
• heavy,
• rare,
• alkaline,
• local,
• impermeable,
• moist,
• beautiful,
• refractory,
• flat,
• common,
• soft,
• absorbent,
• magnetic,
• greek,
• unstable,
• light,
• hidden,
• deep,
• colloidal,
• changing,
• natural,
• packed,
• solid,
• outside,
• siliceous,
• firm,
• under,

Simple categories matching firm:

• whitefish,
• surface,
• policy,
• meat,
• fish,
• fabric,
• ceiling,
• vegetable,
• food,
• input,
• substance,
• substrate,
• involvement,
• soil,
• fruit,
• upright,
• object,
• body,
• veggie,
• part,
• variable,
• collar,
• dimension,
• feature,
• characteristic,
• material,
• performance,
• competency,
• foodstuff,
• earth,
• attribute,
• component,
• topic,
• particle,
• integration,
• fillet,
• structure,
• assets,
• size,
• happening,
• support,
• function,
• area,
• base,
• activity,
• level,
• mixture,
• apple,
• behavior,
• tissue,
• measure,
• foundation,
• commitment,
• quality,
• program,
• container,
• item,
• melon,
• information,
• data,
• candy,
• fixture,
• solid,
• ground,
• practice,
• rock,
• success,
• cookie,
• shape,
• value,
• trait,
• thread,
• plum,
• move,
• control,
• resource,
• plate,
• organization,