slew vs inundation

slew and inundation both are nouns.

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

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

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

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

slew (verb)	inundation (verb)
turn sharply; change direction abruptly
move obliquely or sideways, usually in an uncontrolled manner