deletion vs erasure

deletion and erasure both are nouns.

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

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

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

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