dye vs piece-dye

dye is a noun but piece-dye is not a noun.

Word	Noun	Adjective	Verb	Adverb
dye	Yes	No	Yes	No
piece-dye	No	No	Yes	No

As verbs, piece-dye is a hyponym of dye; that is, piece-dye is a word with a more specific, narrower meaning than dye:

Other hyponyms of dye include bronze, dye, stain, deep-dye, impress, yarn-dye, stain, fast dye, double dye, hand-dye.

dye (noun)	piece-dye (noun)
a usually soluble substance for staining or coloring e.g. fabrics or hair

dye (verb)	piece-dye (verb)
color with dye	dye after weaving
color for microscopic study