Quercus nigra vs possum oak

Quercus nigra and possum oak both are nouns.

Word	Noun	Adjective	Verb	Adverb
Quercus nigra	Yes	No	No	No
possum oak	Yes	No	No	No

As nouns, Quercus nigra and possum oak are synonyms defined as:

Quercus nigra and possum oak: relatively tall deciduous water oak of southeastern United States often cultivated as a shade tree; thrives in wet soil

Other synonyms of Quercus nigra include water oak.

Quercus nigra (noun)	possum oak (noun)
relatively tall deciduous water oak of southeastern United States often cultivated as a shade tree; thrives in wet soil	relatively tall deciduous water oak of southeastern United States often cultivated as a shade tree; thrives in wet soil