brown ash vs black ash

brown ash and black ash both are nouns.

Word	Noun	Adjective	Verb	Adverb
brown ash	Yes	No	No	No
black ash	Yes	No	No	No

As nouns, brown ash and black ash are synonyms defined as:

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

Other synonyms of brown ash include basket ash, Fraxinus nigra, hoop ash.

brown ash (noun)	black ash (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