flood vs deluge

flood and deluge both are nouns.

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

As nouns, flood and deluge are synonyms defined as:

flood and deluge: the rising of a body of water and its overflowing onto normally dry land

Other synonyms of flood include alluvion, inundation.

As nouns, flood and deluge are synonyms defined as:

Other synonyms of flood include inundation, torrent.

As verbs, deluge is a hyponym of flood; that is, deluge is a word with a more specific, narrower meaning than flood:

Other hyponyms of flood include flow, inundate, submerge, drench, swamp.

As verbs, flood and deluge are synonyms defined as:

Other synonyms of flood include inundate, swamp.

flood (noun)	deluge (noun)
the act of flooding; filling to overflowing	a heavy rain
a large flow	the rising of a body of water and its overflowing onto normally dry land
light that is a source of artificial illumination having a broad beam; used in photography	an overwhelming number or amount
the occurrence of incoming water (between a low tide and the following high tide)
the rising of a body of water and its overflowing onto normally dry land
an overwhelming number or amount

flood (verb)	deluge (verb)
cover with liquid, usually water	fill or cover completely, usually with water
become filled to overflowing	charge someone with too many tasks
fill quickly beyond capacity; as with a liquid	fill quickly beyond capacity; as with a liquid
supply with an excess of