exemplary vs warning

exemplary is not a noun while warning is a noun.

Word	Noun	Adjective	Verb	Adverb
exemplary	No	Yes	No	No
warning	Yes	Yes	No	No

As adjectives, exemplary and warning are synonyms defined as:

Other synonyms of exemplary include admonitory, cautionary, monitory.

exemplary (noun)	warning (noun)
	a message informing of danger
	cautionary advice about something imminent (especially imminent danger or other unpleasantness)
	notification of something, usually in advance

exemplary (adjective)	warning (adjective)
serving to warn	serving to warn
being or serving as an illustration of a type
worthy of imitation