Nutshell and Rundown

Nutshell noun - The shell around the kernel of a nut.

Rundown and nutshell are semantically related. in summary topic. In some cases you can use "Rundown" instead a noun "Nutshell", when it comes to topics like short statement of main points.

Rundown noun - A concluding summary (as in presenting a case before a law court).

Nutshell and rundown are semantically related. Sometimes you can use "Nutshell" instead a noun "Rundown".