spate vs tidy sum

spate and tidy sum both are nouns.

Word	Noun	Adjective	Verb	Adverb
spate	Yes	No	No	No
tidy sum	Yes	No	No	No

As nouns, spate and tidy sum are synonyms defined as:

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

spate (noun)	tidy sum (noun)
the occurrence of a water flow resulting from sudden rain or melting snow	(often followed by `of') a large number or amount or extent
a sudden forceful flow
(often followed by `of') a large number or amount or extent