Abies grandis vs silver fir

Abies grandis and silver fir both are nouns.

Word	Noun	Adjective	Verb	Adverb
Abies grandis	Yes	No	No	No
silver fir	Yes	No	No	No

As nouns, silver fir is a hypernym of Abies grandis; that is, silver fir is a word with a broader meaning than Abies grandis:

Abies grandis: lofty fir of the Pacific coast of northwestern America having long curving branches and deep green leaves
silver fir: any of various true firs having leaves white or silvery white beneath

Abies grandis (noun)	silver fir (noun)
lofty fir of the Pacific coast of northwestern America having long curving branches and deep green leaves	any of various true firs having leaves white or silvery white beneath