Hell vs Tartarus

Hell and Tartarus both are nouns.

Word	Noun	Adjective	Verb	Adverb
Hell	Yes	No	No	No
Tartarus	Yes	No	No	No

As nouns, Tartarus is a hyponym of Hell; that is, Tartarus is a word with a more specific, narrower meaning than Hell:

Hell: (Christianity) the abode of Satan and the forces of evil; where sinners suffer eternal punishment
Tartarus: a place where the wicked are punished after death

Other hyponyms of Hell include Gehenna, hellfire, red region.

Hell (noun)	Tartarus (noun)
(Christianity) the abode of Satan and the forces of evil; where sinners suffer eternal punishment	a place where the wicked are punished after death
(religion) the world of the dead