inundation vs hatful

inundation and hatful both are nouns.

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

As nouns, hatful is a hypernym of inundation; that is, hatful is a word with a broader meaning than inundation:

inundation (noun)	hatful (noun)
the rising of a body of water and its overflowing onto normally dry land	as many or as much as a hat will hold
an overwhelming number or amount	(often followed by `of') a large number or amount or extent