UPDATE... Nice start....

1. CJY Conjury (the Fallible Fiend), Cajolery (my poor answer which was trumped by TFF for shortest and then by dxb for longest), Conjugally (dxb)
2. AUQ stAtUesQue (dxb) this is the one I had (autosequence will probably be a word shortly TFF)
3. FBF febrifuge (dxb.... longer than the word I have, but it is a derivative)
4. GFM (engulfment ... tsuwm....good but 10 letters bigger than 8)
5. GJG
6. GMV
7. IMJ
8. IQB
9. JZT jazziest (good one tsuwm)
10. KXY
11. MZB
12. OKV
13. SVF
14. TFV
15. TZU
16. WJE
17. XQA
18. YVC (Polyvalence 11 letters.... TEd REmington), but there is a shorter one... and polyvinyl chloride is two words
19. QDM Quondam (TEd REmington), this is the one I had in mind
20. PZB (polarizable.... tsuwm 11 letters better than my 12 letter hypnotizable)

I'm not saying I have definitive answers as evidenced by #1, but I do have at least one answer for each of them.