\'SHEF\.

chef

 noun \ˈshef\

1

: a skilled cook who manages the kitchen (as of a restaurant)

2

: cook

— chef intransitive verb

— chef·dom noun

 See chef defined for English-language learners »

Examples of CHEF

1. The hotel's chef trained at the finest culinary institutes in Europe.
2. He's the head chef at a five-star restaurant.
3. a celebrity chef with her own TV show
4. My friend is an excellent chef.

Origin of CHEF

French, short for chef de cuisine head of the kitchen

First Known Use: 1840

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http://www.merriam-webster.com/dictionary/chef

    And so this is the definition of a chef, sourced from the link above.  Breaking down the first definition, there are a few glaring words.  The first being Skilled.  With the adjective, the online dictionary authors chose to use a term which denotes a level of ability, not title.  So we can gather, an un-skilled cook who manages the kitchen is not, by definition, a chef.  On to the next word, cook.  As a noun, it describes a person, but when as a verb, Cook, defines a person by the integrity of their dish.  And the last word of note, the ever-elusive word/action Manage.  So simple, provide employees with the opportunity and tools necessary to succeed.  But the terroir of a chef, determines their Ninja definition. 

nin·ja  (nnj)

n. ninja 

A member of a class of 14th-century Japanese mercenary agents who were trained in the martial arts and hired for covert operations such as assassination and sabotage.