One word substitution

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Across
  1. 3. One who loves mankind.
  2. 5. A person who speaks many languages
  3. 6. A disease prevalent across the world at the same time.
  4. 7. Keeping oneself and things around clean
Down
  1. 1. The arrangement of events or dates in the order of their occurrence.
  2. 2. A keeper or custodian of a museum.
  3. 4. Text that cannot be read
  4. 6. One who journeys to a holy place for religious reasons