class Chrysophyceae vs Heterokontae

class Chrysophyceae and Heterokontae both are nouns.

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

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

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

Other synonyms of class Chrysophyceae include Chrysophyceae, class Heterokontae.

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