Preserve, Conserve, Restore

1.

• Preserve (보존): Trying to keep something in its original state. ex) Think of canning fruit. You are preserving it by keeping it from rotting.
• Conserve (보전): Trying to make wise use of a situation. ex) A forestry company that plans to replant trees that have been taken is practicing conservation.
• Restore (복구): Trying to rebuild or repair damage done. ex) Think of restoring an old car. You are removing rusty panels and making it more like a new car."

출처: Preserve, Conserve, Restore (http://www.coolschool.ca/)

2. Synonyms: defend, protect, guard, preserve, shield, safeguard

These verbs mean to make or keep safe from danger, attack, or harm:

• Defend implies repelling an attack: defending her territory; defended his reputation.
• Protect often suggests providing a barrier to discomfort, injury, or attack: bought a dog to protect the children; wore sunglasses to protect her eyes.
• Guard suggests keeping watch: guarded the house against intruders.
• To preserve is to take measures to maintain something in safety: ecologists working to preserve our natural resources.
• Shield suggests protecting with a piece of defensive armor: hid the newspaper to shield me from the bad news.
• Safeguard stresses protection against potential danger: The Bill of Rights safeguards our individual liberties.
  
  출처: http://www.thefreedictionary.com/defend