white fir vs Colorado fir

white fir and Colorado fir both are nouns.

Word	Noun	Adjective	Verb	Adverb
white fir	Yes	No	No	No
Colorado fir	Yes	No	No	No

As nouns, white fir and Colorado fir are synonyms defined as:

white fir and Colorado fir: medium to tall fir of central to western United States having a narrow erect crown and soft wood

Other synonyms of white fir include Abies concolor, Abies lowiana, California white fir.

white fir (noun)	Colorado fir (noun)
medium to tall fir of western North America having a conic crown and branches in tiers; leaves smell of orange when crushed	medium to tall fir of central to western United States having a narrow erect crown and soft wood
medium to tall fir of central to western United States having a narrow erect crown and soft wood