Fagus sylvatica purpurea vs purple beech

Fagus sylvatica purpurea and purple beech both are nouns.

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

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

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

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

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