hair coloring vs dyestuff

hair coloring and dyestuff both are nouns.

Word	Noun	Adjective	Verb	Adverb
hair coloring	Yes	No	No	No
dyestuff	Yes	No	No	No

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

hair coloring: a dye for coloring the hair
dyestuff: a usually soluble substance for staining or coloring e.g. fabrics or hair

Other hypernyms of hair coloring include dye.

hair coloring (noun)	dyestuff (noun)
the act of dyeing or tinting one's hair	a usually soluble substance for staining or coloring e.g. fabrics or hair
coloring of the hair
a dye for coloring the hair