Nightwalker and Night rider

Nightwalker noun - Terrestrial worm that burrows into and helps aerate soil; often surfaces when the ground is cool or wet; used as bait by anglers.

Night rider and nightwalker are semantically related. In some cases you can use "Night rider" instead a noun "Nightwalker".

Night rider noun - Member of a secret mounted band in United States South after the American Civil War; committed acts of intimidation and revenge.

Nightwalker and night rider are semantically related. You can use "Nightwalker" instead a noun phrase "Night rider".