hatful vs haymow

hatful and haymow both are nouns.

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

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

Other hyponyms of hatful include deluge, flood, inundation, torrent.

hatful (noun)	haymow (noun)
as many or as much as a hat will hold	a loft in a barn where hay is stored
(often followed by `of') a large number or amount or extent	a mass of hay piled up in a barn for preservation