Prefix AB and ABS means away, from, separation

The GRE words having the prefix ab and abs are

Word	Meaning
Abdicate	To give up; as, abdicate a throne
Abduct	To lead away by force, kinship
Aberration	Act of wandering away , unsoundness of mind (abnormal ; deviant)
Abhor	To turn away from; loathe; (detest ; hate)
Abjure	To swear away; renounce
Ablution	The act of washing away; often in a rite
Abnegate	To relinquish; give up forever (renunciation ; self-sacrifice)
Abnormal	Away from normal; aberrant
Abolish	Do away with; completely destroy
Abrasion	A rubbing or scraping away
Abrogate	To repel; to do away with (abolish)
Abscond	To steal away and hide; to decamp
Absolve	To free from blame; exonerate (pardon)
Abstain	Hold off from; restrain from eating or drinking
Abstract	Draw away; separate from association (not concrete ; not representational)