spate vs debris storm

spate and debris storm both are nouns.

Word	Noun	Adjective	Verb	Adverb
spate	Yes	No	No	No
debris storm	Yes	No	No	No

As nouns, debris storm is a hyponym of spate; that is, debris storm is a word with a more specific, narrower meaning than spate:

spate: a sudden forceful flow
debris storm: the sudden spread of dust and debris from a collapsing building

Other hyponyms of spate include debris surge, onrush.

spate (noun)	debris storm (noun)
the occurrence of a water flow resulting from sudden rain or melting snow	the sudden spread of dust and debris from a collapsing building
a sudden forceful flow
(often followed by `of') a large number or amount or extent