caution vs admonish

caution is a noun but admonish is not a noun.

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

As verbs, caution and admonish are synonyms defined as:

Other synonyms of caution include monish.

caution (noun)	admonish (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

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