flood out vs deluge

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

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

As verbs, flood out and deluge are synonyms defined as:

Other synonyms of flood out include overwhelm.

flood out (noun)	deluge (noun)
	a heavy rain
	the rising of a body of water and its overflowing onto normally dry land
	an overwhelming number or amount

flood out (verb)	deluge (verb)
charge someone with too many tasks	fill or cover completely, usually with water
	charge someone with too many tasks
	fill quickly beyond capacity; as with a liquid