Nightwalker and Noctambulist

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.

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

Noctambulist noun - Someone who walks about in their sleep.

Nightwalker and noctambulist are semantically related. Sometimes you can replace term "Nightwalker" with "Noctambulist", this nouns are similar.