abandonment vs defection

abandonment and defection both are nouns.

Word	Noun	Adjective	Verb	Adverb
abandonment	Yes	No	No	No
defection	Yes	No	No	No

As nouns, abandonment and defection are synonyms defined as:

abandonment and defection: withdrawing support or help despite allegiance or responsibility

Other synonyms of abandonment include desertion.

abandonment (noun)	defection (noun)
withdrawing support or help despite allegiance or responsibility	withdrawing support or help despite allegiance or responsibility
the voluntary surrender of property (or a right to property) without attempting to reclaim it or give it away	the state of having rejected your religious beliefs for your political party or a cause (often in favor of opposing beliefs or causes)
the act of giving something up