Nightwalker and Oligochaete

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

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

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