Heterokontae vs class Chrysophyceae

Heterokontae and class Chrysophyceae both are nouns.

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

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

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

Other synonyms of Heterokontae include Chrysophyceae, class Heterokontae.

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