Cyanobacteria and Eubacterium

Cyanobacteria noun - Predominantly photosynthetic prokaryotic organisms containing a blue pigment in addition to chlorophyll; occur singly or in colonies in diverse habitats; important as phytoplankton.

Eubacterium and cyanobacteria are semantically related. In some cases you can use "Eubacterium" instead a noun "Cyanobacteria".

Eubacterium noun - A large group of bacteria having rigid cell walls; motile types have flagella.

Cyanobacteria and eubacterium are semantically related. Sometimes you can replace term "Cyanobacteria" with "Eubacterium", this nouns are similar.