damned vs infernal

damned and infernal both are nouns.

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

As adjectives, damned and infernal are synonyms defined as:

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

damned (noun)	infernal (noun)
people who are condemned to eternal punishment	an inhabitant of Hell

damned (adjective)	infernal (adjective)
expletives used informally as intensifiers	being of the underworld
in danger of the eternal punishment of Hell	characteristic of or resembling Hell
	of or pertaining to or characteristic of a very uncontrolled and intense fire
	expletives used informally as intensifiers
	extremely evil or cruel; expressive of cruelty or befitting hell

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