goddam vs damned

goddam is not a noun while damned is a noun.

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

As adjectives, goddam and damned are synonyms defined as:

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

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

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

goddam (adverb)	damned (adverb)
expressing anger, despair, frustration, approval, or surprise	in a damnable manner