Night-walker and Red worm

Red worm and night-walker are semantically related. In some cases you can use "Red worm" instead a noun phrase "Night-walker".

Red worm 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-walker and red worm are semantically related. Sometimes you can replace phrase "Night-walker" with "Red worm", this phrases are similar.