I don’t know what to call this

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