copper beech vs purple beech

copper beech and purple beech both are nouns.

Word	Noun	Adjective	Verb	Adverb
copper beech	Yes	No	No	No
purple beech	Yes	No	No	No

As nouns, copper beech and purple beech are synonyms defined as:

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

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

copper beech (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