decipherment vs decryption

decipherment and decryption both are nouns.

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

As nouns, decipherment and decryption are synonyms defined as:

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

Other synonyms of decipherment include decoding.

decipherment (noun)	decryption (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