Negation

4 clues
Denial
Rebuttal
Disclaimer
Theme of this puzzle
Similar answers:
Abbreviation
Abbreviations
Abducktion
Abduction
Aberration
Aberrations
Abjuration
Ablation
Ablution
Abnegate
Abnegated
Abnegates
Abnegative
Abnegator
Abnegators
Abolition
Abolitions
Abomination
Abortion
Abovementioned