Hedeoma vs asterid dicot genus

Hedeoma and asterid dicot genus both are nouns.

Word	Noun	Adjective	Verb	Adverb
Hedeoma	Yes	No	No	No
asterid dicot genus	Yes	No	No	No

As nouns, asterid dicot genus is a hypernym of Hedeoma; that is, asterid dicot genus is a word with a broader meaning than Hedeoma:

Hedeoma: small genus of American herbs (American pennyroyal)
asterid dicot genus: genus of more or less advanced dicotyledonous herbs and some trees and shrubs

Hedeoma (noun)	asterid dicot genus (noun)
small genus of American herbs (American pennyroyal)	genus of more or less advanced dicotyledonous herbs and some trees and shrubs