red silver fir vs silver fir

red silver fir and silver fir both are nouns.

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

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

red silver fir: medium to tall fir of western North America having a conic crown and branches in tiers; leaves smell of orange when crushed
silver fir: any of various true firs having leaves white or silvery white beneath

red silver fir (noun)	silver fir (noun)
medium to tall fir of western North America having a conic crown and branches in tiers; leaves smell of orange when crushed	any of various true firs having leaves white or silvery white beneath