good deal vs haymow

good deal and haymow both are nouns.

Word	Noun	Adjective	Verb	Adverb
good deal	Yes	No	No	No
haymow	Yes	No	No	No

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

Other hyponyms of good deal include deluge, flood, inundation, torrent.

good deal (noun)	haymow (noun)
(often followed by `of') a large number or amount or extent	a loft in a barn where hay is stored
	a mass of hay piled up in a barn for preservation