grand fir vs silver fir

grand fir and silver fir both are nouns.

Word	Noun	Adjective	Verb	Adverb
grand fir	Yes	No	No	No
silver fir	Yes	No	No	No

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

grand fir: 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

grand fir (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