Across
- 4. DEMOcracy
- 5. CONTRAdict
- 7. ASTRonomy
- 8. DECade
- 10. LUNAr
- 11. Marx ISM
- 14. OCTAgon
- 15. STEREOtype
- 17. SURplus
- 18. VITAlity
- 19. interSTELLar
- 22. ALTERnative
Down
- 1. TETRAhedron
- 2. THERMOstat
- 3. GYROscope
- 6. SONar
- 7. HELIOcentric
- 9. GEOgraphy
- 10. thermoMETER
- 12. HYPERactive
- 13. DYNAmic
- 16. teleSCOPE
- 18. AMATeur
- 20. CHRONological
- 21. reCOGNize