sour gum vs Nyssa sylvatica

sour gum and Nyssa sylvatica both are nouns.

Word	Noun	Adjective	Verb	Adverb
sour gum	Yes	No	No	No
Nyssa sylvatica	Yes	No	No	No

As nouns, sour gum and Nyssa sylvatica are synonyms defined as:

sour gum and Nyssa sylvatica: columnar tree of eastern North America having horizontal limbs and small leaves that emerge late in spring and have brilliant color in early fall

Other synonyms of sour gum include black gum, pepperidge.

sour gum (noun)	Nyssa sylvatica (noun)
columnar tree of eastern North America having horizontal limbs and small leaves that emerge late in spring and have brilliant color in early fall	columnar tree of eastern North America having horizontal limbs and small leaves that emerge late in spring and have brilliant color in early fall