concern vs burden

concern and burden both are nouns.

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

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

Other hyponyms of concern include bugaboo, encumbrance, incumbrance, load, onus, business.

concern (noun)	burden (noun)
something that interests you because it is important or affects you	weight to be borne or conveyed
something or someone that causes anxiety; a source of unhappiness	the central idea that is expanded in a document or discourse
a feeling of sympathy for someone or something	an onerous or difficult concern
an anxious feeling	the central meaning or theme of a speech or literary work
a commercial or industrial enterprise and the people who constitute it

concern (verb)	burden (verb)
be relevant to	impose a task upon, assign a responsibility to
be on the mind of	weight down with a load