decoding vs decryption

decoding and decryption both are nouns.

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

As nouns, decoding and decryption are synonyms defined as:

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

Other synonyms of decoding include decipherment.

decoding (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