purple beech vs Fagus purpurea

purple beech and Fagus purpurea both are nouns.

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

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

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

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

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