class Pyrenomycetes vs order Sphaeriales

class Pyrenomycetes and order Sphaeriales both are nouns.

Word	Noun	Adjective	Verb	Adverb
class Pyrenomycetes	Yes	No	No	No
order Sphaeriales	Yes	No	No	No

class Pyrenomycetes (noun)	order Sphaeriales (noun)
class of fungi in which the fruiting body is a perithecium; includes powdery mildews and ergot and Neurospora	large order of ascomycetous fungi usually having a dark hard perithecia with definite ostioles; in more recent classifications often divided among several orders