Possible Clues:

• Subtleties
• Subtle distinctions
• Subtle differences
• Shades
• Subtle differences detected in new blended sauce with hidden name
• Fine shades (of meaning)
• Sister takes a short time over subtle shades
• The shades you'll get from the cane in the sun
• Shades of meaning
• 'Shades' is not found in 'Pests'