underperformer vs concern

underperformer and concern both are nouns.

Word	Noun	Adjective	Verb	Adverb
underperformer	Yes	No	No	No
concern	Yes	No	Yes	No

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

underperformer: a business that is less successful than expected
concern: a commercial or industrial enterprise and the people who constitute it

Other hypernyms of underperformer include business, business concern, business organisation, business organization.

underperformer (noun)	concern (noun)
a business that is less successful than expected	something that interests you because it is important or affects you
a student who does not perform as well as expected or as well as the IQ indicates	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

underperformer (verb)	concern (verb)
	be relevant to
	be on the mind of