wailer vs utterer

wailer and utterer both are nouns.

Word	Noun	Adjective	Verb	Adverb
wailer	Yes	No	No	No
utterer	Yes	No	No	No

As nouns, utterer is a hypernym of wailer; that is, utterer is a word with a broader meaning than wailer:

wailer: a mourner who utters long loud high-pitched cries
utterer: someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)

Other hypernyms of wailer include griever, lamenter, mourner, sorrower, speaker, talker, verbaliser, verbalizer.

wailer (noun)	utterer (noun)
a mourner who utters long loud high-pitched cries	someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)
	someone who circulates forged banknotes or counterfeit coins
	an organism that can utter vocal sounds