Acer palmatum vs Japanese maple

Acer palmatum and Japanese maple both are nouns.

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

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

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

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