hatful vs mountain

hatful and mountain both are nouns.

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

As nouns, hatful and mountain are synonyms defined as:

hatful and mountain: (often followed by `of') a large number or amount or extent

hatful (noun)	mountain (noun)
as many or as much as a hat will hold	a land mass that projects well above its surroundings; higher than a hill
(often followed by `of') a large number or amount or extent	(often followed by `of') a large number or amount or extent