abase (v.) (After being overthrown and abased, the deposed leader offered to bow down to his conqueror.)

to humiliate, degrade

abate (v.) (The rain poured down for a while, then abated.)

to reduce, lessen

abdicate (v.) (When he realized that the revolutionaries would surely win, the king abdicated his throne.)

to give up a position, usually one of leadership

abduct (v.) (The evildoers abducted the fairy princess from her happy home.)

to kidnap, take by force

aberration (n.) (In 1918, the Boston Red Sox won the World Series, but the success turned out to be an aberration, and the Red Sox have not won a World Series since.)

something that differs from the norm