class Cyanophyceae vs division Cyanophyta

class Cyanophyceae and division Cyanophyta both are nouns.

Word	Noun	Adjective	Verb	Adverb
class Cyanophyceae	Yes	No	No	No
division Cyanophyta	Yes	No	No	No

class Cyanophyceae (noun)	division Cyanophyta (noun)
photosynthetic bacteria found in fresh and salt water, having chlorophyll a and phycobilins; once thought to be algae: blue-green algae	prokaryotic organisms sometimes considered a class or phylum or subkingdom; coextensive with the Cyanophyceae: cyanobacteria (blue-green algae)