indigo vs dyestuff

indigo and dyestuff both are nouns.

Word	Noun	Adjective	Verb	Adverb
indigo	Yes	Yes	No	No
dyestuff	Yes	No	No	No

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

indigo: a blue dye obtained from plants or made synthetically
dyestuff: a usually soluble substance for staining or coloring e.g. fabrics or hair

Other hypernyms of indigo include dye.

indigo (noun)	dyestuff (noun)
a blue-violet color	a usually soluble substance for staining or coloring e.g. fabrics or hair
deciduous subshrub of southeastern Asia having pinnate leaves and clusters of red or purple flowers; a source of indigo dye
a blue dye obtained from plants or made synthetically

indigo (adjective)	dyestuff (adjective)
having a color between blue and violet