piece of material vs cloth

piece of material and cloth both are nouns.

Word	Noun	Adjective	Verb	Adverb
piece of material	Yes	No	No	No
cloth	Yes	No	No	No

As nouns, cloth is a hypernym of piece of material; that is, cloth is a word with a broader meaning than piece of material:

piece of material: a separate part consisting of fabric
cloth: artifact made by weaving or felting or knitting or crocheting natural or synthetic fibers

Other hypernyms of piece of material include fabric, material, textile, piece.

piece of material (noun)	cloth (noun)
a separate part consisting of fabric	artifact made by weaving or felting or knitting or crocheting natural or synthetic fibers