I love English

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Across
  1. 2. relating to seeing or sight; something that can be seen
  2. 4. extremely large in size, amount, or extent
  3. 6. the act of examining the similarities or differences between two or more things
  4. 9. to be successful, especially in financial or economic terms
  5. 11. not common or frequent; unusual or scarce
  6. 12. a standard or rule used to judge or decide something
  7. 13. a change or difference in condition, amount, or level
  8. 14. to make safe or protected; to obtain firmly
  9. 16. the position or condition of a person or thing in relation to others
  10. 17. a polite word or sign of welcome when meeting someone
Down
  1. 1. relating to life and living organisms
  2. 3. a period of time used for a particular activity, like a meeting or class
  3. 5. made from or using plants, especially for medicine or health
  4. 7. difficult to understand or explain; full of mystery
  5. 8. based on what is seen or known, but not yet proven
  6. 10. an unwelcome intrusion into another's space or territory
  7. 12. to exist together at the same time or in the same place
  8. 15. the height of an object or place above sea level