Baptisia lactea vs wild indigo

Baptisia lactea and wild indigo both are nouns.

Word	Noun	Adjective	Verb	Adverb
Baptisia lactea	Yes	No	No	No
wild indigo	Yes	No	No	No

As nouns, wild indigo is a hypernym of Baptisia lactea; that is, wild indigo is a word with a broader meaning than Baptisia lactea:

Baptisia lactea: erect or spreading herb having racemes of creamy white flowers; the eastern United States
wild indigo: any of several plants of the genus Baptisia

Other hypernyms of Baptisia lactea include false indigo.

Baptisia lactea (noun)	wild indigo (noun)
erect or spreading herb having racemes of creamy white flowers; the eastern United States	any of several plants of the genus Baptisia