keeper

Concise Oxford English Dictionary © 2008 Oxford University Press:
keeper/ˈkiːpə(r)/

▶noun

• 1 a person who manages or looks after something or someone.

• 2 short for goalkeeper or wicketkeeper.

• 3 an object which protects or secures another.

• 4 a bar of soft iron placed across the poles of a horseshoe magnet to maintain its strength.

• 5 American Football a play in which the quarterback receives the ball from the centre and runs with it.

– derivatives
keepership noun.