packaging vs subject matter

packaging and subject matter both are nouns.

Word	Noun	Adjective	Verb	Adverb
packaging	Yes	No	No	No
subject matter	Yes	No	No	No

As nouns, subject matter is a hypernym of packaging; that is, subject matter is a word with a broader meaning than packaging:

packaging: a message issued in behalf of some product or cause or idea or person or institution
subject matter: content communicating a message; what something is about

Other hypernyms of packaging include content, message, substance.

packaging (noun)	subject matter (noun)
the business of packing	content communicating a message; what something is about
material used to make packages
a message issued in behalf of some product or cause or idea or person or institution