false indigo vs wild indigo

false indigo and wild indigo both are nouns.

Word	Noun	Adjective	Verb	Adverb
false indigo	Yes	No	No	No
wild indigo	Yes	No	No	No

As nouns, false indigo and wild indigo are synonyms defined as:

false indigo and wild indigo: any of several plants of the genus Baptisia

false indigo (noun)	wild indigo (noun)
an erect to spreading hairy shrub of the Pacific coast of the United States having racemes of red to indigo flowers	any of several plants of the genus Baptisia
dense shrub of moist riverbanks and flood plains of the eastern United States having attractive fragrant foliage and dense racemes of dark purple flowers
any of several plants of the genus Baptisia