Hostage and Yardbird

Hostage noun - A prisoner who is held by one party to insure that another party will meet specified terms.

Yardbird and hostage are semantically related In some cases you can use "Yardbird" instead a noun "Hostage".

Yardbird noun - A military recruit who is assigned menial tasks.

Hostage and yardbird are semantically related in person jailed for crime topic. Sometimes you can use "Hostage" instead a noun "Yardbird".