class Ascomycetes vs subdivision Ascomycotina

class Ascomycetes and subdivision Ascomycotina both are nouns.

Word	Noun	Adjective	Verb	Adverb
class Ascomycetes	Yes	No	No	No
subdivision Ascomycotina	Yes	No	No	No

class Ascomycetes (noun)	subdivision Ascomycotina (noun)
large class of higher fungi coextensive with division Ascomycota: sac fungi	a large subdivision of Eumycota including Hemiascomycetes and Plectomycetes and Pyrenomycetes and Discomycetes; sac fungi; in some classification systems considered a division of the kingdom Fungi