Across
- 4. gerund form of endure
- 6. noun form of happy
- 9. adverb form of extreme
- 10. verb form of threat
- 12. noun form of combine
- 13. verb form of population
Down
- 1. noun form of disagree
- 2. adjective form of efficiency
- 3. adjective form of use
- 5. adverb form of quick
- 7. verb form of apology
- 8. adjective form of mechanic
- 11. adjective form of nature