indigo broom vs Baptisia tinctoria

indigo broom and Baptisia tinctoria both are nouns.

Word	Noun	Adjective	Verb	Adverb
indigo broom	Yes	No	No	No
Baptisia tinctoria	Yes	No	No	No

As nouns, indigo broom and Baptisia tinctoria are synonyms defined as:

indigo broom and Baptisia tinctoria: much-branched erect herb with bright yellow flowers; distributed from Massachusetts to Florida

Other synonyms of indigo broom include horsefly weed, rattle weed.

indigo broom (noun)	Baptisia tinctoria (noun)
much-branched erect herb with bright yellow flowers; distributed from Massachusetts to Florida	much-branched erect herb with bright yellow flowers; distributed from Massachusetts to Florida