worry vs burden

worry and burden both are nouns.

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

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

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

worry (noun)	burden (noun)
something or someone that causes anxiety; a source of unhappiness	weight to be borne or conveyed
a strong feeling of anxiety	the central idea that is expanded in a document or discourse
	an onerous or difficult concern
	the central meaning or theme of a speech or literary work

worry (verb)	burden (verb)
lacerate by biting	impose a task upon, assign a responsibility to
touch or rub constantly	weight down with a load
be worried, concerned, anxious, troubled, or uneasy
disturb the peace of mind of; afflict with mental agitation or distress
be concerned with
be on the mind of