packaging company vs packaging concern

packaging company and packaging concern both are nouns.

Word	Noun	Adjective	Verb	Adverb
packaging company	Yes	No	No	No
packaging concern	Yes	No	No	No

As nouns, packaging company and packaging concern are synonyms defined as:

packaging company and packaging concern: a company that packages goods for sale or shipment or storage

packaging company (noun)	packaging concern (noun)
a company that packages goods for sale or shipment or storage	a company that packages goods for sale or shipment or storage