fluorochrome vs dyestuff

fluorochrome and dyestuff both are nouns.

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

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

fluorochrome: any of various fluorescent substances used in fluorescence microscopy to stain specimens
dyestuff: a usually soluble substance for staining or coloring e.g. fabrics or hair

Other hypernyms of fluorochrome include dye.

fluorochrome (noun)	dyestuff (noun)
any of various fluorescent substances used in fluorescence microscopy to stain specimens	a usually soluble substance for staining or coloring e.g. fabrics or hair