Big gun and Big cat

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

Big cat and big gun are semantically related in very important person topic. In some cases you can use "Big cat" instead a noun phrase "Big gun".

Big cat noun - Any of several large cats typically able to roar and living in the wild.

Big gun and big cat are semantically related in very important person topic. Sometimes you can use "Big gun" instead a noun phrase "Big cat".