field maple vs maple

field maple and maple both are nouns.

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

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

field maple: shrubby Eurasian maple often used as a hedge
maple: any of numerous trees or shrubs of the genus Acer bearing winged seeds in pairs; north temperate zone

field maple (noun)	maple (noun)
shrubby Eurasian maple often used as a hedge	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