General "shell":
* खोल (khol) - This is the most common and general translation for "shell." It can refer to the outer covering of a mollusk, a protective shell, or even a shell of a building.
Shell as a container:
* खोल (khol) - This word can also be used for a container, like a shell for a bullet.
Shell as a program:
* शेल (shel) - This is the most accurate translation for "shell" when referring to a command-line interpreter like bash or zsh.
Shell as a part of a structure:
* खोल (khol) - This word can be used for the outer covering of a building or any other structure.
The best way to know which translation is correct depends on the context of the sentence.