In a nutshell and Second class

In a nutshell adverb - Summed up briefly.

Second class and in a nutshell are semantically related. In some cases you can use "Second class" instead an adjective phrase "In a nutshell".

Second class noun - Not the highest quality in a classification.

In a nutshell and second class are semantically related. Sometimes you can use "In a nutshell" instead an adjective phrase "Second class".