Nightwalker and Oligochaete 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.

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

Oligochaete worm noun - Hermaphroditic terrestrial and aquatic annelids having bristles borne singly along the length of the body.

Nightwalker and oligochaete worm are semantically related. Sometimes you can replace term "Nightwalker" with "Oligochaete worm", this terms are similar.