polyester vs ester

polyester and ester both are nouns.

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

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

polyester: a complex ester used for making fibers or resins or plastics or as a plasticizer
ester: organic compound formed by reaction between an acid and an alcohol with elimination of water

Other hypernyms of polyester include plastic.

polyester (noun)	ester (noun)
any of a large class of synthetic fabrics	organic compound formed by reaction between an acid and an alcohol with elimination of water
any of numerous synthetic resins; they are light and strong and weather resistant
a complex ester used for making fibers or resins or plastics or as a plasticizer