darned vs damned

darned is not a noun while damned is a noun.

Word	Noun	Adjective	Verb	Adverb
darned	No	Yes	No	No
damned	Yes	Yes	No	Yes

As adjectives, darned and damned are synonyms defined as:

Other synonyms of darned include blame, blamed, blasted, blessed, damn, deuced, goddam, goddamn, goddamned, infernal.

darned (noun)	damned (noun)
	people who are condemned to eternal punishment

darned (adjective)	damned (adjective)
expletives used informally as intensifiers	expletives used informally as intensifiers
	in danger of the eternal punishment of Hell

darned (adverb)	damned (adverb)
	in a damnable manner