coding vs decipherment

coding and decipherment both are nouns.

Word	Noun	Adjective	Verb	Adverb
coding	Yes	No	No	No
decipherment	Yes	No	No	No

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

coding: act of writing in code or cipher
decipherment: the activity of making clear or converting from code into plain text

Other hyponyms of coding include encoding, encryption, recoding, decoding, decryption.

coding (noun)	decipherment (noun)
act of writing in code or cipher	the activity of making clear or converting from code into plain text