vending vs merchandising

vending and merchandising both are nouns.

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

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

Other hypernyms of vending include marketing, selling.

vending (noun)	merchandising (noun)
the act of selling goods for a living	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