polyester vs fabric

polyester and fabric both are nouns.

Word	Noun	Adjective	Verb	Adverb
polyester	Yes	No	No	No
fabric	Yes	No	No	No

As nouns, fabric is a hypernym of polyester; that is, fabric is a word with a broader meaning than polyester:

polyester: any of a large class of synthetic fabrics
fabric: artifact made by weaving or felting or knitting or crocheting natural or synthetic fibers

Other hypernyms of polyester include cloth, material, textile.

polyester (noun)	fabric (noun)
any of a large class of synthetic fabrics	artifact made by weaving or felting or knitting or crocheting natural or synthetic fibers
any of numerous synthetic resins; they are light and strong and weather resistant	the underlying structure
a complex ester used for making fibers or resins or plastics or as a plasticizer