maleate vs ester

maleate and ester both are nouns.

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

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

maleate: a salt or ester of maleic acid; used as a nontricyclic antidepressant drug for psychomotor activation
ester: organic compound formed by reaction between an acid and an alcohol with elimination of water

Other hypernyms of maleate include antidepressant, antidepressant drug.

maleate (noun)	ester (noun)
a salt or ester of maleic acid; used as a nontricyclic antidepressant drug for psychomotor activation	organic compound formed by reaction between an acid and an alcohol with elimination of water