Crawlers and Red worm

Red worm and crawlers are semantically related. In some cases you can use "Red worm" instead a noun "Crawlers".

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.

Crawlers and red worm are semantically related. Sometimes you can replace term "Crawlers" with "Red worm", this terms are similar.