infernal vs departed

infernal and departed both are nouns.

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

As nouns, departed is a hypernym of infernal; that is, departed is a word with a broader meaning than infernal:

Other hypernyms of infernal include dead person, dead soul, deceased, deceased person, decedent.

infernal (noun)	departed (noun)
an inhabitant of Hell	someone who is no longer alive

infernal (adjective)	departed (adjective)
being of the underworld	dead
characteristic of or resembling Hell	well in the past; former
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