slew vs deluge

slew and deluge both are nouns.

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

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

Other hyponyms of slew include flood, inundation, torrent, haymow.

slew (noun)	deluge (noun)
(often followed by `of') a large number or amount or extent	a heavy rain
	the rising of a body of water and its overflowing onto normally dry land
	an overwhelming number or amount

slew (verb)	deluge (verb)
turn sharply; change direction abruptly	fill or cover completely, usually with water
move obliquely or sideways, usually in an uncontrolled manner	charge someone with too many tasks
	fill quickly beyond capacity; as with a liquid