Simple categories matching earthen:

• embankment,
• appearance,
• structure,
• mound,
• material,
• construction,
• formation,

Members with property earthen:

• clay,
• silicate,
• sand,
• levee,
• pit,
• basin,
• chalk,
• monk_mound,
• embankment_dam,
• stone,
• dirt_roads,
• stucco,
• soil,
• gravel,
• road,
• metal,
• earthen_dam,
• peat,
• stream_modification,
• dam,
• hill,
• rubble,
• small_dam,
• shell,
• dike,
• grinding,
• ant_hill,
• dust,
• straw,
• mountain,
• roof,
• diversion_ditch,
• bamboo,
• dolomite,
• steel,
• earth,
• natural_wood,
• marble,
• rock_clay,
• plywood_sheet,
• sump,
• sod,
• crushed_stone,
• silt,
• drainage_windows,
• liner,
• natural_pigment,
• sandy_soil,
• loam,
• shale,
• side_wall,
• he,
• adobe,
• slate,
• diversion_dike,
• liquid,
• rock,
• brick_stone,
• cap,
• trench,
• subterranean_formation,
• dirt,
• wood,
• limestone,
• mud,
• waste_rock,
• canal,
• embankment,