blue stem vs Andropogon gerardii

blue stem and Andropogon gerardii both are nouns.

Word	Noun	Adjective	Verb	Adverb
blue stem	Yes	No	No	No
Andropogon gerardii	Yes	No	No	No

As nouns, blue stem and Andropogon gerardii are synonyms defined as:

blue stem and Andropogon gerardii: tall grass with smooth bluish leaf sheaths grown for hay in the United States

Other synonyms of blue stem include Andropogon furcatus, bluestem.

blue stem (noun)	Andropogon gerardii (noun)
tall grass with smooth bluish leaf sheaths grown for hay in the United States	tall grass with smooth bluish leaf sheaths grown for hay in the United States