white beech vs American beech

white beech and American beech both are nouns.

Word	Noun	Adjective	Verb	Adverb
white beech	Yes	No	No	No
American beech	Yes	No	No	No

As nouns, white beech and American beech are synonyms defined as:

white beech and American beech: North American forest tree with light green leaves and edible nuts

Other synonyms of white beech include Fagus americana, Fagus grandifolia, red beech.

white beech (noun)	American beech (noun)
North American forest tree with light green leaves and edible nuts	North American forest tree with light green leaves and edible nuts