wad vs inundation

wad and inundation both are nouns.

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

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

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

wad (noun)	inundation (noun)
a wad of something chewable as tobacco	the rising of a body of water and its overflowing onto normally dry land
(often followed by `of') a large number or amount or extent	an overwhelming number or amount
a small mass of soft material

wad (verb)	inundation (verb)
crowd or pack to capacity
compress into a wad