Modifiers matching coal:

• primary,
• particulate,
• hard,
• wet,
• bituminous,
• solid,
• rich,
• domestic,
• volatile,

Simple categories matching wet:

• pollutant,
• space,
• material,
• substance,
• area,
• land,
• sealant,
• photography,
• location,
• place,
• cloth,
• matter,
• article,
• surface,
• craft,
• entertainment,
• vegetable,
• item,
• market,
• medium,
• ingredient,
• mixture,
• concrete,
• form,
• fluid,
• season,
• clothes,
• food,
• work,
• period,
• treatment,
• web,
• lubricant,
• room,
• feed,
• seed,
• condition,
• process,
• cleaner,
• laundry,
• atmosphere,
• air,
• fruit,
• precipitation,
• processing,
• soil,
• beverage,
• covering,
• solid,
• cover,
• pulp,
• job,
• works,
• object,
• floor,
• trade,
• ground,
• plating,
• years,
• paper,
• wood,
• ecosystem,
• activity,
• appliance,
• waste,
• residue,
• climate,
• dish,
• footwear,
• building,
• equipment,
• application,
• substrate,
• mammal,
• organs,
• deposit,
• paste,
• sludge,
• year,
• particle,
• occupation,
• acid,
• clothing,
• chemical,
• structure,
• task,
• system,
• thing,
• tissue,
• fuel,
• coal,
• stuff,
• composition,
• metal,
• component,
• precipitate,
• brush,
• fitting,
• condiment,
• discipline,
• prey,
• environment,
• commodity,
• fibre,
• fly,
• situation,
• leaf,
• sweetmeat,
• coating,
• liquid,
• product,
• sediment,
• fabric,
• game,
• weather,
• month,
• site,
• grassland,
• facility,
• installation,