Nightwalker and Red worm

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.

Red worm is a synonym for nightwalker. In some cases you can use "Red worm" instead a noun "Nightwalker".

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.

Nightwalker is a synonym for red worm. You can use "Nightwalker" instead a noun phrase "Red worm".