fold vs unfold

fold is a noun but unfold is not a noun.

Word	Noun	Adjective	Verb	Adverb
fold	Yes	No	Yes	No
unfold	No	No	Yes	No

fold (noun)	unfold (noun)
the act of folding
a pen for sheep
a folded part (as in skin or muscle)
a group of people who adhere to a common faith and habitually attend a given church
a group of sheep or goats
a geological process that causes a bend in a stratum of rock
an angular or rounded shape made by folding

fold (verb)	unfold (verb)
incorporate a food ingredient into a mixture by repeatedly turning it over without stirring or beating	develop or come to a promising stage
become folded or folded up	spread out or open from a closed or folded state
bend or lay so that one part covers the other	extend or stretch out to a greater or the full length
confine in a fold, like sheep	open to the view
cease to operate or cause to cease operating