admonisher vs reminder

admonisher and reminder both are nouns.

Word	Noun	Adjective	Verb	Adverb
admonisher	Yes	No	No	No
reminder	Yes	No	No	No

As nouns, admonisher and reminder are synonyms defined as:

admonisher and reminder: someone who gives a warning so that a mistake can be avoided

Other synonyms of admonisher include monitor.

admonisher (noun)	reminder (noun)
someone who gives a warning so that a mistake can be avoided	an experience that causes you to remember something
	a message that helps you remember something
	someone who gives a warning so that a mistake can be avoided