like a song in 2 voices. II

123456789
Across
  1. 3. - song
  2. 5. - first [feminine adjective]
  3. 6. - boundless [from boundless]
  4. 8. - (она) trills [from to trill]
  5. 9. - trills [from trill]
Down
  1. 1. - expanse
  2. 2. - part [feminine noun]
  3. 3. - songbird [compound noun]
  4. 4. - voice
  5. 7. - echo