telling vs informative

telling is a noun but informative is not a noun.

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

telling (noun)	informative (noun)
informing by words
an act of narration
disclosing information or giving evidence about another

telling (adjective)	informative (adjective)
producing a strong effect	providing or conveying information
disclosing unintentionally something concealed	tending to increase knowledge or dissipate ignorance
powerfully persuasive	serving to instruct or enlighten or inform