buttonwood vs American plane

buttonwood and American plane both are nouns.

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

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

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

Other synonyms of buttonwood include American sycamore, Platanus occidentalis.

buttonwood (noun)	American plane (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