dust cover vs piece of cloth

dust cover and piece of cloth both are nouns.

Word	Noun	Adjective	Verb	Adverb
dust cover	Yes	No	No	No
piece of cloth	Yes	No	No	No

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

dust cover: a large piece of cloth used to cover furniture that is not in use for a long period
piece of cloth: a separate part consisting of fabric

Other hypernyms of dust cover include piece of material.

dust cover (noun)	piece of cloth (noun)
a removable plastic protective covering for a piece of equipment	a separate part consisting of fabric
a large piece of cloth used to cover furniture that is not in use for a long period
a paper jacket for a book; a jacket on which promotional information is usually printed