cascade down vs cascade

cascade down is not a noun while cascade is a noun.

Word	Noun	Adjective	Verb	Adverb
cascade down	No	No	Yes	No
cascade	Yes	No	Yes	No

As verbs, cascade down and cascade are synonyms defined as:

cascade down (noun)	cascade (noun)
	a sudden downpour (as of tears or sparks etc) likened to a rain shower
	a succession of stages or operations or processes or units
	a small waterfall or series of small waterfalls

cascade down (verb)	cascade (verb)
rush down in big quantities, like a cascade	arrange (open windows) on a computer desktop so that they overlap each other, with the title bars visible
	rush down in big quantities, like a cascade