direct dye vs dye

direct dye and dye both are nouns.

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

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

direct dye: dye with a high affinity for cellulose fibers (cotton or rayon etc.)
dye: a usually soluble substance for staining or coloring e.g. fabrics or hair

Other hypernyms of direct dye include dyestuff.

direct dye (noun)	dye (noun)
dye with a high affinity for cellulose fibers (cotton or rayon etc.)	a usually soluble substance for staining or coloring e.g. fabrics or hair

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