Tartarus or "tartaroo" is the "inspired" word from the original manuscripts that's only used once in the scriptures.
But, the King James translators copied many of the scriptures from other translations [like the Latin Vulgate], as much as, or more than from original manuscripts. The result was that whatever translation errors that may have been introduced into other translations of the scriptures were copied straight into the KJV.
This one inspired use of the word 'tartarus' they copied from the Latin Vulgate... and tartarus became "hell" in the KJV. Four "different words" became translated into the word "hell" in the KJV... and tartarus was one of them.
Tartarus is more of a "condition of restraint," as opposed to a "place."
It's Peter who uses this inspired 'tartarus' in reference to the "angels that sinned.":
"For if God spared not the angels that sinned, but cast them down to hell[tartarus], and delivered them into chains of darkness, to be reserved unto Judgment..." (II Peter.2:4).
It is not mentioned in that form in The Bible. Tartarus is only known in Hellenistic Jewish literature from the Greek text in 1 Enoch 20:2. It does appear as tartaroo in some translations of 2 Peter 2:4, but not in the KJV.
Additional Comments:
The term 'Tartarus' comes from the Greek word 'Tartaroo' and is only used one time in Scripture in 2 Peter 2:4 as noted. It is one of three Greek terms for 'hell' used in the Bible. Tartarus was a place of final punishment. Tartarus involves severe limitation of actions, symbolized by chains, and almost total lack of understanding symbolized by darkness.
2 Peter 2:4King James Version (KJV)4For if God spared not the angels that sinned, but cast them down to hell (literally Tartarus), and delivered them into chains of darkness, to be reserved unto judgment;
2 peter chapter2 verse 4.
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