Abies lasiocarpa vs silver fir

Abies lasiocarpa and silver fir both are nouns.

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

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

Abies lasiocarpa: medium-tall timber tree of the Rocky Mountains having a narrowly conic to columnar crown
silver fir: any of various true firs having leaves white or silvery white beneath

Abies lasiocarpa (noun)	silver fir (noun)
medium-tall timber tree of the Rocky Mountains having a narrowly conic to columnar crown	any of various true firs having leaves white or silvery white beneath