1. Much less
   - let alone, not to mention

1. It does not matter
   - no matter

Encyclopedia: Never mind

• horizontal stabiliser
• horizontal stabilizer
• horizontal surface
• horizontal tail
• horizontality
• horizontally
• hormesis
• hormogonium
• hormonal
• hormone
• hormone-replacement therapy
• horn
• horn button
• horn fly
• horn in
• Horn of Africa
• horn of plenty
• horn poppy
• horn-rimmed
• horn-shaped
• hornbeam
• hornbill
• hornblende
• hornbook
• Horne