Chrysophyceae vs class Heterokontae

Chrysophyceae and class Heterokontae both are nouns.

Word	Noun	Adjective	Verb	Adverb
Chrysophyceae	Yes	No	No	No
class Heterokontae	Yes	No	No	No

As nouns, Chrysophyceae and class Heterokontae are synonyms defined as:

Chrysophyceae and class Heterokontae: all the yellow-green algae having flagella of unequal length

Other synonyms of Chrysophyceae include class Chrysophyceae, Heterokontae.

Chrysophyceae (noun)	class Heterokontae (noun)
all the yellow-green algae having flagella of unequal length	all the yellow-green algae having flagella of unequal length