Abies bracteata vs true fir

Abies bracteata and true fir both are nouns.

Word	Noun	Adjective	Verb	Adverb
Abies bracteata	Yes	No	No	No
true fir	Yes	No	No	No

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

Abies bracteata: a pyramidal fir of southwestern California having spiny pointed leaves and cone scales with long spines
true fir: any of various evergreen trees of the genus Abies; chiefly of upland areas

Other hypernyms of Abies bracteata include fir, fir tree.

Abies bracteata (noun)	true fir (noun)
a pyramidal fir of southwestern California having spiny pointed leaves and cone scales with long spines	any of various evergreen trees of the genus Abies; chiefly of upland areas