fir vs Abies venusta

fir and Abies venusta both are nouns.

Word	Noun	Adjective	Verb	Adverb
fir	Yes	No	No	No
Abies venusta	Yes	No	No	No

As nouns, Abies venusta is a hyponym of fir; that is, Abies venusta is a word with a more specific, narrower meaning than fir:

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

Other hyponyms of fir include silver fir, Abies bracteata, bristlecone fir, Santa Lucia fir.

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