mountain maple vs maple

mountain maple and maple both are nouns.

Word	Noun	Adjective	Verb	Adverb
mountain maple	Yes	No	No	No
maple	Yes	No	No	No

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

mountain maple: small shrubby maple of eastern North America; scarlet in autumn
maple: any of numerous trees or shrubs of the genus Acer bearing winged seeds in pairs; north temperate zone

mountain maple (noun)	maple (noun)
small shrubby maple of eastern North America; scarlet in autumn	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