sweet wattle vs acacia

sweet wattle and acacia both are nouns.

Word	Noun	Adjective	Verb	Adverb
sweet wattle	Yes	No	No	No
acacia	Yes	No	No	No

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

sweet wattle: 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

sweet wattle (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