folding vs collapsible

folding is a noun but collapsible is not a noun.

Word	Noun	Adjective	Verb	Adverb
folding	Yes	Yes	No	No
collapsible	No	Yes	No	No

folding (noun)	collapsible (noun)
the act of folding
the process whereby a protein molecule assumes its intricate three-dimensional shape
a geological process that causes a bend in a stratum of rock

folding (adjective)	collapsible (adjective)
capable of being folded up and stored	capable of collapsing or being collapsed