damned vs darned

damned is a noun but darned is not a noun.

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

As adjectives, damned and darned are synonyms defined as:

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

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

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

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