class Charophyceae vs order Charales

class Charophyceae and order Charales both are nouns.

Word	Noun	Adjective	Verb	Adverb
class Charophyceae	Yes	No	No	No
order Charales	Yes	No	No	No

class Charophyceae (noun)	order Charales (noun)
in some classifications: contains only the order Charales	small order of macroscopic fresh and brackish water algae with a distinct axis: stoneworts