division Tracheophyta vs subdivision Pteropsida

division Tracheophyta and subdivision Pteropsida both are nouns.

Word	Noun	Adjective	Verb	Adverb
division Tracheophyta	Yes	No	No	No
subdivision Pteropsida	Yes	No	No	No

division Tracheophyta (noun)	subdivision Pteropsida (noun)
in former classifications: comprising plants with a vascular system including ferns and fern allies as well as seed plants	used in former classifications to include all ferns and flowering plants and divided into the three classes Filicinae and Gymnospermae and Angiospermae