Magnolia grandiflora vs southern magnolia

Magnolia grandiflora and southern magnolia both are nouns.

Word	Noun	Adjective	Verb	Adverb
Magnolia grandiflora	Yes	No	No	No
southern magnolia	Yes	No	No	No

As nouns, Magnolia grandiflora and southern magnolia are synonyms defined as:

Magnolia grandiflora and southern magnolia: evergreen tree of southern United States having large stiff glossy leaves and huge white sweet-smelling flowers

Other synonyms of Magnolia grandiflora include bull bay, evergreen magnolia, large-flowering magnolia.

Magnolia grandiflora (noun)	southern magnolia (noun)
evergreen tree of southern United States having large stiff glossy leaves and huge white sweet-smelling flowers	evergreen tree of southern United States having large stiff glossy leaves and huge white sweet-smelling flowers