Fagus purpurea vs Fagus sylvatica purpurea

Fagus purpurea and Fagus sylvatica purpurea both are nouns.

Word	Noun	Adjective	Verb	Adverb
Fagus purpurea	Yes	No	No	No
Fagus sylvatica purpurea	Yes	No	No	No

As nouns, Fagus purpurea and Fagus sylvatica purpurea are synonyms defined as:

Fagus purpurea and Fagus sylvatica purpurea: variety of European beech with shining purple or copper-colored leaves

Other synonyms of Fagus purpurea include copper beech, Fagus sylvatica atropunicea, purple beech.

Fagus purpurea (noun)	Fagus sylvatica purpurea (noun)
variety of European beech with shining purple or copper-colored leaves	variety of European beech with shining purple or copper-colored leaves