admonish vs caution

admonish is not a noun while caution is a noun.

Word	Noun	Adjective	Verb	Adverb
admonish	No	No	Yes	No
caution	Yes	No	Yes	No

As verbs, admonish and caution are synonyms defined as:

Other synonyms of admonish include monish.

admonish (noun)	caution (noun)
	the trait of being cautious; being attentive to possible danger
	the trait of being circumspect and prudent
	judiciousness in avoiding harm or danger
	a warning against certain acts

admonish (verb)	caution (verb)
take to task	warn strongly; put on guard
warn strongly; put on guard
advise or counsel in terms of someone's behavior