decryption vs decoding

decryption and decoding both are nouns.

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

As nouns, decryption and decoding are synonyms defined as:

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

Other synonyms of decryption include decipherment.

decryption (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