Big shot and Nob

Big shot noun - One of high position or importance within a group.

Nob and big shot are semantically related (British) In some cases you can use "Nob" instead a noun phrase "Big shot".

Nob noun - The upper or front part of the body that contains the brain, the major sense organs, and the mouth.

Big shot and nob are semantically related in aristocrat topic. You can use "Big shot" instead a noun "Nob".