principal vs principalship

principal and principalship both are nouns.

Word	Noun	Adjective	Verb	Adverb
principal	Yes	Yes	No	No
principalship	Yes	No	No	No

principal (noun)	principalship (noun)
the educator who has executive authority for a school	the post of principal
an actor who plays a principal role
the major party to a financial transaction at a stock exchange; buys and sells for his own account
(criminal law) any person involved in a criminal offense, regardless of whether the person profits from such involvement
the original amount of a debt on which interest is calculated
capital as contrasted with the income derived from it

principal (adjective)	principalship (adjective)
most important element