green alder vs alder

green alder and alder both are nouns.

Word	Noun	Adjective	Verb	Adverb
green alder	Yes	No	No	No
alder	Yes	No	No	No

As nouns, alder is a hypernym of green alder; that is, alder is a word with a broader meaning than green alder:

green alder: shrub of mountainous areas of Europe
alder: north temperate shrubs or trees having toothed leaves and conelike fruit; bark is used in tanning and dyeing and the wood is rot-resistant

Other hypernyms of green alder include alder tree.

As nouns, alder is a hypernym of green alder; that is, alder is a word with a broader meaning than green alder:

green alder: North American shrub with light green leaves and winged nuts
alder: north temperate shrubs or trees having toothed leaves and conelike fruit; bark is used in tanning and dyeing and the wood is rot-resistant

Other hypernyms of green alder include alder tree.

green alder (noun)	alder (noun)
shrub of mountainous areas of Europe	north temperate shrubs or trees having toothed leaves and conelike fruit; bark is used in tanning and dyeing and the wood is rot-resistant
North American shrub with light green leaves and winged nuts	wood of any of various alder trees; resistant to underwater rot; used for bridges etc