Diatomophyceae vs class Diatomophyceae

Diatomophyceae and class Diatomophyceae both are nouns.

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

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

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

Other synonyms of Diatomophyceae include Bacillariophyceae, class Bacillariophyceae.

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