payload vs merchandise

payload and merchandise both are nouns.

Word	Noun	Adjective	Verb	Adverb
payload	Yes	No	No	No
merchandise	Yes	No	Yes	No

As nouns, merchandise is a hypernym of payload; that is, merchandise is a word with a broader meaning than payload:

Other hypernyms of payload include product, ware.

payload (noun)	merchandise (noun)
goods carried by a large vehicle	items for sale to the individual consumer
the front part of a guided missile or rocket or torpedo that carries the nuclear or explosive charge or the chemical or biological agents	branded products meant to promote another product, especially films and pop groups

payload (verb)	merchandise (verb)
	engage in the trade of