indigo plant vs Indigofera tinctoria

indigo plant and Indigofera tinctoria both are nouns.

Word	Noun	Adjective	Verb	Adverb
indigo plant	Yes	No	No	No
Indigofera tinctoria	Yes	No	No	No

As nouns, indigo plant and Indigofera tinctoria are synonyms defined as:

indigo plant and Indigofera tinctoria: deciduous subshrub of southeastern Asia having pinnate leaves and clusters of red or purple flowers; a source of indigo dye

Other synonyms of indigo plant include indigo.

indigo plant (noun)	Indigofera tinctoria (noun)
deciduous subshrub of southeastern Asia having pinnate leaves and clusters of red or purple flowers; a source of indigo dye	deciduous subshrub of southeastern Asia having pinnate leaves and clusters of red or purple flowers; a source of indigo dye