decryption vs steganography

decryption and steganography both are nouns.

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

As nouns, steganography is a hypernym of decryption; that is, steganography is a word with a broader meaning than decryption:

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

Other hypernyms of decryption include coding, cryptography, secret writing.

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