Cyanobacteria and True bacteria

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.

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

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

Cyanobacteria and true bacteria are semantically related. Sometimes you can replace term "Cyanobacteria" with "True bacteria", this terms are similar.