Acacia farnesiana vs acacia

Acacia farnesiana and acacia both are nouns.

Word	Noun	Adjective	Verb	Adverb
Acacia farnesiana	Yes	No	No	No
acacia	Yes	No	No	No

As nouns, acacia is a hypernym of Acacia farnesiana; that is, acacia is a word with a broader meaning than Acacia farnesiana:

Acacia farnesiana: tropical American thorny shrub or small tree; fragrant yellow flowers used in making perfumery
acacia: any of various spiny trees or shrubs of the genus Acacia

Acacia farnesiana (noun)	acacia (noun)
tropical American thorny shrub or small tree; fragrant yellow flowers used in making perfumery	any of various spiny trees or shrubs of the genus Acacia