singing vs telling

singing and telling both are nouns.

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

As nouns, singing and telling are synonyms defined as:

singing and telling: disclosing information or giving evidence about another

Other synonyms of singing include tattle.

singing (noun)	telling (noun)
the act of singing vocal music	informing by words
disclosing information or giving evidence about another	an act of narration
	disclosing information or giving evidence about another

singing (adjective)	telling (adjective)
smooth and flowing	producing a strong effect
	disclosing unintentionally something concealed
	powerfully persuasive