decampment vs abandonment

decampment and abandonment both are nouns.

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

As nouns, abandonment is a hypernym of decampment; that is, abandonment is a word with a broader meaning than decampment:

decampment: the act of running away secretly (as to avoid arrest)
abandonment: withdrawing support or help despite allegiance or responsibility

Other hypernyms of decampment include defection, desertion.

decampment (noun)	abandonment (noun)
breaking camp	withdrawing support or help despite allegiance or responsibility
the act of running away secretly (as to avoid arrest)	the voluntary surrender of property (or a right to property) without attempting to reclaim it or give it away
	the act of giving something up