decipherment vs decoding

decipherment and decoding both are nouns.

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

As nouns, decipherment and decoding are synonyms defined as:

decipherment and decoding: the activity of making clear or converting from code into plain text

Other synonyms of decipherment include decryption.

decipherment (noun)	decoding (noun)
the activity of making clear or converting from code into plain text	the activity of making clear or converting from code into plain text