decrease vs scale down

decrease is a noun but scale down is not a noun.

Word	Noun	Adjective	Verb	Adverb
decrease	Yes	No	Yes	No
scale down	No	No	Yes	No

decrease (noun)	scale down (noun)
the act of decreasing or reducing something
the amount by which something decreases
a change downward
a process of becoming smaller or shorter

decrease (verb)	scale down (verb)
decrease in size, extent, or range	reduce proportionally
make become smaller	make smaller