Cochineal insect and Scale insect

Cochineal insect noun - Mexican red scale insect that feeds on cacti; the source of a red dye.

Scale insect and cochineal insect are semantically related. In some cases you can use "Scale insect" instead a noun phrase "Cochineal insect".

Scale insect noun - Small homopterous insect that usually lives and feeds on plants and secretes a protective waxy covering.

Cochineal insect and scale insect are semantically related. Sometimes you can replace phrase "Cochineal insect" with "Scale insect", this phrases are similar.