acid dye vs dye

acid dye and dye both are nouns.

Word	Noun	Adjective	Verb	Adverb
acid dye	Yes	No	No	No
dye	Yes	No	Yes	No

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

acid dye: dye in which the chromophore is part of a negative ion
dye: a usually soluble substance for staining or coloring e.g. fabrics or hair

Other hypernyms of acid dye include dyestuff.

acid dye (noun)	dye (noun)
dye in which the chromophore is part of a negative ion	a usually soluble substance for staining or coloring e.g. fabrics or hair

acid dye (verb)	dye (verb)
	color with dye
	color for microscopic study