doyen

As nouns the difference between doyen and oldtimer

is that doyen is most senior representative of a certain group, usually in diplomacy, academia or performing arts, doyen while oldtimer is vintage car or antique aircraft.

As nouns the difference between doyen and chief

is that doyen is most senior representative of a certain group, usually in diplomacy, academia or performing arts, doyen while chief is (senseid)a leader or head of a group of people, organisation, etc.

As an adjective chief is

primary; principal.

As nouns the difference between maven and doyen

is that maven is an expert in a given field while doyen is a commander in charge of ten men.

As a proper noun MAVEN

is a space probe designed to investigate the Martian climate.

As nouns the difference between doyen and dozen

is that doyen is most senior representative of a certain group, usually in diplomacy, academia or performing arts, doyen while dozen is (countable) a set of twelve.