telling vs warning

telling and warning both are nouns.

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

As nouns, warning is a hyponym of telling; that is, warning is a word with a more specific, narrower meaning than telling:

Other hyponyms of telling include notice.

telling (noun)	warning (noun)
informing by words	a message informing of danger
an act of narration	cautionary advice about something imminent (especially imminent danger or other unpleasantness)
disclosing information or giving evidence about another	notification of something, usually in advance

telling (adjective)	warning (adjective)
producing a strong effect	serving to warn
disclosing unintentionally something concealed
powerfully persuasive