Acer japonicum vs maple

Acer japonicum and maple both are nouns.

Word	Noun	Adjective	Verb	Adverb
Acer japonicum	Yes	No	No	No
maple	Yes	No	No	No

As nouns, maple is a hypernym of Acer japonicum; that is, maple is a word with a broader meaning than Acer japonicum:

Acer japonicum: leaves deeply incised and bright red in autumn; Japan
maple: any of numerous trees or shrubs of the genus Acer bearing winged seeds in pairs; north temperate zone

Acer japonicum (noun)	maple (noun)
leaves deeply incised and bright red in autumn; Japan	any of numerous trees or shrubs of the genus Acer bearing winged seeds in pairs; north temperate zone
	wood of any of various maple trees; especially the hard close-grained wood of the sugar maple; used especially for furniture and flooring