Select the option that can be used as a one-word substitute for the given group of words.

A close-fitting cover for the blade of a knife or sword

Sheath

he one-word substitute for "a close-fitting cover for the blade of a knife or sword" is sheath.

• Shield is a defensive weapon that is used to protect the body from attack.
• Case is a container that is used to protect something from damage.
• Carrier is a person or thing that transports something.