dumping vs merchandising

dumping and merchandising both are nouns.

Word	Noun	Adjective	Verb	Adverb
dumping	Yes	No	No	No
merchandising	Yes	No	No	No

As nouns, merchandising is a hypernym of dumping; that is, merchandising is a word with a broader meaning than dumping:

dumping: selling goods abroad at a price below that charged in the domestic market
merchandising: the exchange of goods for an agreed sum of money

Other hypernyms of dumping include marketing, selling.

dumping (noun)	merchandising (noun)
selling goods abroad at a price below that charged in the domestic market	the exchange of goods for an agreed sum of money
	the business of drawing public attention to goods and services
	branded products meant to promote another product, especially films and pop groups