Oligochaete worm and Segmented worm

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

Segmented worm and oligochaete worm are semantically related. In some cases you can use "Segmented worm" instead a noun phrase "Oligochaete worm".

Segmented worm noun - Worms with cylindrical bodies segmented both internally and externally.

Oligochaete worm and segmented worm are semantically related. Sometimes you can replace phrase "Oligochaete worm" with "Segmented worm", this phrases are similar.