slew vs spate

slew and spate both are nouns.

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

As nouns, slew and spate are synonyms defined as:

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

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

slew (verb)	spate (verb)
turn sharply; change direction abruptly
move obliquely or sideways, usually in an uncontrolled manner