deletion vs expurgation

deletion and expurgation both are nouns.

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

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

Other hyponyms of deletion include castration, censoring, censorship, erasure, expunction, expunging.

deletion (noun)	expurgation (noun)
the act of deleting something written or printed	the deletion of objectionable parts from a literary work
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