large-flowering magnolia vs Magnolia grandiflora

large-flowering magnolia and Magnolia grandiflora both are nouns.

Word	Noun	Adjective	Verb	Adverb
large-flowering magnolia	Yes	No	No	No
Magnolia grandiflora	Yes	No	No	No

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

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

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

large-flowering magnolia (noun)	Magnolia grandiflora (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