List 12
1. supernatural
2. supersonic
3. superlative
4. superintendent
5. subordinate
6. subterranean
7. submerge
8. subconscious
9. precede
10. premeditated
11. forewarned
12. forecast
13. postpone
14. postwar
15. postscript
16. postdated
17. transcontinental
18. transfusion
19. transplant
20. transmission