purple beech vs Fagus sylvatica purpurea

purple beech and Fagus sylvatica purpurea both are nouns.

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

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

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

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

purple beech (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