Ballista and Pocketknife

Ballista noun - An engine that provided medieval artillery used during sieges; a heavy war engine for hurling large stones and other missiles.

Pocketknife and ballista are semantically related. In some cases you can use "Pocketknife" instead a noun "Ballista".

Pocketknife noun - A knife with a blade that folds into the handle; suitable for carrying in the pocket.

Ballista and pocketknife are semantically related. Sometimes you can use "Ballista" instead a noun "Pocketknife".