class Chytridiomycetes vs Mastigomycotina

class Chytridiomycetes and Mastigomycotina both are nouns.

Word	Noun	Adjective	Verb	Adverb
class Chytridiomycetes	Yes	No	No	No
Mastigomycotina	Yes	No	No	No

class Chytridiomycetes (noun)	Mastigomycotina (noun)
a class of mostly aquatic fungi; saprophytic or parasitic on algae or fungi or plants	fungi in which the spores and gametes are motile; in some systems placed in the Phycomycetes group with the Zygomycota