expert; adept; experienced; a person who has extensive knowledge or skill in a specific field

to see; to look at; to watch; to read (silently)

the way to do something; a clever method; a trick of the trade

A person who lacks professional knowledge or experience in a specific field, or the quality of being amateur or nonprofessional in a line of work.

to see; to look at; to watch; to read (silently)

a lively scene or bustling activity; fun or mirth that comes from a crowd or celebration