brass buttons vs Cotula coronopifolia

brass buttons and Cotula coronopifolia both are nouns.

Word	Noun	Adjective	Verb	Adverb
brass buttons	Yes	No	No	No
Cotula coronopifolia	Yes	No	No	No

As nouns, brass buttons and Cotula coronopifolia are synonyms defined as:

brass buttons and Cotula coronopifolia: South African herb with golden-yellow globose flower heads; naturalized in moist areas along coast of California; cultivated as an ornamental

brass buttons (noun)	Cotula coronopifolia (noun)
South African herb with golden-yellow globose flower heads; naturalized in moist areas along coast of California; cultivated as an ornamental	South African herb with golden-yellow globose flower heads; naturalized in moist areas along coast of California; cultivated as an ornamental