flood out vs burden

flood out is not a noun while burden is a noun.

Word	Noun	Adjective	Verb	Adverb
flood out	No	No	Yes	No
burden	Yes	No	Yes	No

As verbs, burden is a hypernym of flood out; that is, burden is a word with a broader meaning than flood out:

Other hypernyms of flood out include charge, saddle.

flood out (noun)	burden (noun)
	weight to be borne or conveyed
	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

flood out (verb)	burden (verb)
charge someone with too many tasks	impose a task upon, assign a responsibility to
	weight down with a load