withdrawal vs desertion

withdrawal and desertion both are nouns.

Word	Noun	Adjective	Verb	Adverb
withdrawal	Yes	No	No	No
desertion	Yes	No	No	No

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

withdrawal (noun)	desertion (noun)
the act of withdrawing	withdrawing support or help despite allegiance or responsibility
formal separation from an alliance or federation	the act of giving something up
the termination of drug taking
the act of taking out money or other capital
a method of birth control in which coitus is initiated but the penis is deliberately withdrawn before ejaculation
the act of withdrawing blood, tumors, etc.
the act of ceasing to participate in an activity
a retraction of a previously held position
avoiding emotional involvement