Japanese maple vs Acer palmatum

Japanese maple and Acer palmatum both are nouns.

Word	Noun	Adjective	Verb	Adverb
Japanese maple	Yes	No	No	No
Acer palmatum	Yes	No	No	No

As nouns, Japanese maple and Acer palmatum are synonyms defined as:

Japanese maple and Acer palmatum: ornamental shrub or small tree of Japan and Korea with deeply incised leaves; cultivated in many varieties

Japanese maple (noun)	Acer palmatum (noun)
leaves deeply incised and bright red in autumn; Japan	ornamental shrub or small tree of Japan and Korea with deeply incised leaves; cultivated in many varieties
ornamental shrub or small tree of Japan and Korea with deeply incised leaves; cultivated in many varieties