common carrier vs concern

common carrier and concern both are nouns.

Word	Noun	Adjective	Verb	Adverb
common carrier	Yes	No	No	No
concern	Yes	No	Yes	No

As nouns, concern is a hypernym of common carrier; that is, concern is a word with a broader meaning than common carrier:

common carrier: a person or firm in the business of transporting people or goods or messages
concern: a commercial or industrial enterprise and the people who constitute it

Other hypernyms of common carrier include business, business concern, business organisation, business organization.

common carrier (noun)	concern (noun)
a person or firm in the business of transporting people or goods or messages	something that interests you because it is important or affects you
	something or someone that causes anxiety; a source of unhappiness
	a feeling of sympathy for someone or something
	an anxious feeling
	a commercial or industrial enterprise and the people who constitute it

common carrier (verb)	concern (verb)
	be relevant to
	be on the mind of