American plane vs American sycamore

American plane and American sycamore both are nouns.

Word	Noun	Adjective	Verb	Adverb
American plane	Yes	No	No	No
American sycamore	Yes	No	No	No

As nouns, American plane and American sycamore are synonyms defined as:

American plane and American sycamore: very large spreading plane tree of eastern and central North America to Mexico

Other synonyms of American plane include buttonwood, Platanus occidentalis.

American plane (noun)	American sycamore (noun)
very large spreading plane tree of eastern and central North America to Mexico	very large spreading plane tree of eastern and central North America to Mexico