formal vs prescribed

formal is a noun but prescribed is not a noun.

Word	Noun	Adjective	Verb	Adverb
formal	Yes	Yes	No	No
prescribed	No	Yes	No	No

formal (noun)	prescribed (noun)
a gown for evening wear
a lavish dance requiring formal attire

formal (adjective)	prescribed (adjective)
being in accord with established forms and conventions and requirements (as e.g. of formal dress)	formally laid down or imposed
(of spoken and written language) adhering to traditional standards of correctness and without casual, contracted, and colloquial forms	set down as a rule or guide
refined or imposing in manner or appearance; befitting a royal court	conforming to set usage, procedure, or discipline
logically deductive	fixed or established especially by order or command
represented in simplified or symbolic form
characteristic of or befitting a person in authority