derogation, recall, revocation, vacation.
abbreviation, abdication, aberration, ablation, abnegation, abomination, acceleration, acclamation, acclimation, accommodation, accreditation, accumulation, accusation, accusation, acidification, activation, adaptation, adjudication, administration, admiration.
noun: the fleshy part of the human body that you sit on.
Unscramble derriere