lactone vs ester

lactone and ester both are nouns.

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

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

lactone: a cyclic intramolecular ester derived from a hydroxy acid.
ester: organic compound formed by reaction between an acid and an alcohol with elimination of water

lactone (noun)	ester (noun)
a cyclic intramolecular ester derived from a hydroxy acid.	organic compound formed by reaction between an acid and an alcohol with elimination of water