expunction vs deletion

expunction and deletion both are nouns.

Word	Noun	Adjective	Verb	Adverb
expunction	Yes	No	No	No
deletion	Yes	No	No	No

As nouns, deletion is a hypernym of expunction; that is, deletion is a word with a broader meaning than expunction:

expunction (noun)	deletion (noun)
deletion by an act of expunging or erasing	the act of deleting something written or printed
	the omission that is made when an editorial change shortens a written passage
	(genetics) the loss or absence of one or more nucleotides from a chromosome
	any process whereby sounds or words are left out of spoken words or phrases