American beech vs Fagus americana

American beech and Fagus americana both are nouns.

Word	Noun	Adjective	Verb	Adverb
American beech	Yes	No	No	No
Fagus americana	Yes	No	No	No

As nouns, American beech and Fagus americana are synonyms defined as:

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

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

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