Underlying actual meanings are not necessarily relevant. (I do not know.)
Jahannam (Wiki): Chewing Gum On a Decay: "Çiğinem"
Hashr: TriLeach (It may be relating to drilling over gathering.) ("haşr olmak": resurrection in Turkish.) (There is a main word directly relates to resurrection. “Qiyamat”)
(The term hash is very similar. In computer science big strings hashed to short constant length strings. To identify themselves and to check for corruptions easily over a short string. Thus named over hashing. Drilling with particle accelerators probably requires unusual gathering of partEagles and also probably condenses particles on the ground to an extreme degree.)
(In hashing overlap is an issue. Which is almost the main theme of Tur.uk. Again it also relates to drilling with particle accelerators and overlap of sound waves.)