Chrysophyceae vs Heterokontae

Chrysophyceae and Heterokontae both are nouns.

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

As nouns, Chrysophyceae and Heterokontae are synonyms defined as:

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

Other synonyms of Chrysophyceae include class Chrysophyceae, class Heterokontae.

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