oct & pent words

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Across
  1. 2. a 3D object with 8 flat faces
  2. 3. a sea creature with 8 tentacles.
  3. 8. (originally) the 8th month of the year
  4. 12. A shape with five faces
  5. 13. a solid figure with five plane faces.
  6. 15. a musical instrument with eight strings or a diatonic series of eight tones (a scale).
  7. 16. a group of eight bits
Down
  1. 1. a group of eight bits.Normally in computing.
  2. 4. a five-pointed star polygon
  3. 5. a series of 8 notes (in music).
  4. 6. A contest featuring five events
  5. 7. five fingers
  6. 9. Five years or group of five
  7. 10. five carbon atoms in a molecule
  8. 11. a pentagram drawn inside a circle.
  9. 14. a 2D shape with 8 angles and sides.