I don’t know what to call this

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Across
  1. 1. a triangle-related adjective
  2. 3. hold stuff in this
  3. 5. acronym that means super close friends
  4. 9. # ⬅️(literally that)
  5. 11. figurative language, ‘boom’, ‘crash, ‘bang’
  6. 13. basically English stuff. Starts with ‘l’
  7. 15. putting yourself in someone else’s shoes
  8. 16. The most populated city in Australia s______
Down
  1. 2. a fancy word for math, starts with ‘n’
  2. 4. annoying people in your family
  3. 6. enjoying something, having ___
  4. 7. encouragement
  5. 8. 😁
  6. 10. plural, you play with them
  7. 12. plural, opposite of nightmares
  8. 14. “___! I love popcorn at movie night!”