southern magnolia vs large-flowering magnolia

southern magnolia and large-flowering magnolia both are nouns.

Word	Noun	Adjective	Verb	Adverb
southern magnolia	Yes	No	No	No
large-flowering magnolia	Yes	No	No	No

As nouns, southern magnolia and large-flowering magnolia are synonyms defined as:

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

Other synonyms of southern magnolia include bull bay, evergreen magnolia, Magnolia grandiflora.

southern magnolia (noun)	large-flowering 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