brown ash vs Fraxinus nigra

brown ash and Fraxinus nigra both are nouns.

Word	Noun	Adjective	Verb	Adverb
brown ash	Yes	No	No	No
Fraxinus nigra	Yes	No	No	No

As nouns, brown ash and Fraxinus nigra are synonyms defined as:

brown ash and Fraxinus nigra: vigorous spreading North American tree having dark brown heavy wood; leaves turn gold in autumn

Other synonyms of brown ash include basket ash, black ash, hoop ash.

brown ash (noun)	Fraxinus nigra (noun)
vigorous spreading North American tree having dark brown heavy wood; leaves turn gold in autumn	vigorous spreading North American tree having dark brown heavy wood; leaves turn gold in autumn