Nightwalker and Sleepwalker

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.

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

Sleepwalker noun - Someone who walks about in their sleep.

Nightwalker and sleepwalker are semantically related. You can use "Nightwalker" instead a noun "Sleepwalker". rare substitute