Chain armor and Coat of mail

Chain armor noun - (Middle Ages) flexible armor made of interlinked metal rings.

Coat of mail and chain armor are semantically related in mail topic. In some cases you can use "Coat of mail" instead a noun phrase "Chain armor", when it comes to topics like chain mail, flexible armor.

Coat of mail noun - Armor that protects the wearer's whole body.

Chain armor and coat of mail are semantically related in mail topic. You can use "Chain armor" instead a noun phrase "Coat of mail", if it concerns topics such as chain mail, armored coat.