defection vs decampment

defection and decampment both are nouns.

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

As nouns, decampment is a hyponym of defection; that is, decampment is a word with a more specific, narrower meaning than defection:

Other hyponyms of defection include abscondment, absence without leave, unauthorized absence, deviationism.

defection (noun)	decampment (noun)
withdrawing support or help despite allegiance or responsibility	breaking camp
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 running away secretly (as to avoid arrest)