cyanine dye vs dyestuff

cyanine dye and dyestuff both are nouns.

Word	Noun	Adjective	Verb	Adverb
cyanine dye	Yes	No	No	No
dyestuff	Yes	No	No	No

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

cyanine dye: any of a class of dyes containing a -CH= group linking two heterocyclic rings containing nitrogen; used as sensitizers in photography
dyestuff: a usually soluble substance for staining or coloring e.g. fabrics or hair

Other hypernyms of cyanine dye include dye.

cyanine dye (noun)	dyestuff (noun)
any of a class of dyes containing a -CH= group linking two heterocyclic rings containing nitrogen; used as sensitizers in photography	a usually soluble substance for staining or coloring e.g. fabrics or hair