Bacillariophyceae vs class Bacillariophyceae

Bacillariophyceae and class Bacillariophyceae both are nouns.

Word	Noun	Adjective	Verb	Adverb
Bacillariophyceae	Yes	No	No	No
class Bacillariophyceae	Yes	No	No	No

As nouns, Bacillariophyceae and class Bacillariophyceae are synonyms defined as:

Bacillariophyceae and class Bacillariophyceae: marine and freshwater eukaryotic algae: diatoms

Other synonyms of Bacillariophyceae include class Diatomophyceae, Diatomophyceae.

Bacillariophyceae (noun)	class Bacillariophyceae (noun)
marine and freshwater eukaryotic algae: diatoms	marine and freshwater eukaryotic algae: diatoms