sales promotion vs packaging

sales promotion and packaging both are nouns.

Word	Noun	Adjective	Verb	Adverb
sales promotion	Yes	No	No	No
packaging	Yes	No	No	No

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

sales promotion: promotion that supplements or coordinates advertising
packaging: a message issued in behalf of some product or cause or idea or person or institution

Other hypernyms of sales promotion include promo, promotion, promotional material, publicity.

sales promotion (noun)	packaging (noun)
promotion that supplements or coordinates advertising	the business of packing
	material used to make packages
	a message issued in behalf of some product or cause or idea or person or institution