spate vs debris surge

spate and debris surge both are nouns.

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

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

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

Other hyponyms of spate include debris storm, onrush.

spate (noun)	debris surge (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