spate vs mountain

spate and mountain both are nouns.

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

As nouns, spate and mountain are synonyms defined as:

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

spate (noun)	mountain (noun)
the occurrence of a water flow resulting from sudden rain or melting snow	a land mass that projects well above its surroundings; higher than a hill
a sudden forceful flow	(often followed by `of') a large number or amount or extent
(often followed by `of') a large number or amount or extent