wholesaler vs packer

wholesaler and packer both are nouns.

Word	Noun	Adjective	Verb	Adverb
wholesaler	Yes	No	No	No
packer	Yes	No	No	No

As nouns, packer is a hyponym of wholesaler; that is, packer is a word with a more specific, narrower meaning than wholesaler:

wholesaler: someone who buys large quantities of goods and resells to merchants rather than to the ultimate customers
packer: a wholesaler in the meat-packing business

Other hyponyms of wholesaler include meat packer.

wholesaler (noun)	packer (noun)
someone who buys large quantities of goods and resells to merchants rather than to the ultimate customers	a workman employed to pack things into containers
	a wholesaler in the meat-packing business
	a hiker who wears a backpack