Simple categories matching shorter:

• period,
• fibre,
• object,
• works,
• fiber,

Members with property shorter:

• wood-pulp_fiber,
• artificial_wool,
• wool,
• cotton,
• week,
• day,
• metal_pipe,
• indian_cotton,
• quarter,
• artificial_cotton,
• six_week,
• six_month,
• song,
• wooden_plank,
• beech,
• staple,
• month,