pullback

As a verb rescind

is to repeal, annul, or declare void; to take (something such as a rule or contract) out of effect.

As a noun pullback is

the act or result of pulling back; a withdrawal.

As nouns the difference between pullback and pullup

is that pullback is the act or result of pulling back; a withdrawal while pullup is an exercise done for strengthening the arms and upper body, in which one lifts one's own weight while hanging from a bar.

As nouns the difference between pullback and fullback

is that pullback is the act or result of pulling back; a withdrawal while fullback is an offensive back whose primary jobs are to block in advance of the halfback on running plays and for the quarterback on passing plays.