Cyanophyceae vs class Cyanobacteria

Cyanophyceae and class Cyanobacteria both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cyanophyceae	Yes	No	No	No
class Cyanobacteria	Yes	No	No	No

As nouns, Cyanophyceae and class Cyanobacteria are synonyms defined as:

Cyanophyceae and class Cyanobacteria: photosynthetic bacteria found in fresh and salt water, having chlorophyll a and phycobilins; once thought to be algae: blue-green algae

Other synonyms of Cyanophyceae include class Cyanophyceae.

Cyanophyceae (noun)	class Cyanobacteria (noun)
photosynthetic bacteria found in fresh and salt water, having chlorophyll a and phycobilins; once thought to be algae: blue-green algae	photosynthetic bacteria found in fresh and salt water, having chlorophyll a and phycobilins; once thought to be algae: blue-green algae