balsam fir vs silver fir

balsam fir and silver fir both are nouns.

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

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

balsam fir: medium-sized fir of northeastern North America; leaves smell of balsam when crushed; much used for pulpwood and Christmas trees
silver fir: any of various true firs having leaves white or silvery white beneath

balsam fir (noun)	silver fir (noun)
medium-sized fir of northeastern North America; leaves smell of balsam when crushed; much used for pulpwood and Christmas trees	any of various true firs having leaves white or silvery white beneath