wailer vs speaker

wailer and speaker both are nouns.

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

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

wailer: a mourner who utters long loud high-pitched cries
speaker: 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, talker, utterer, verbaliser, verbalizer.

wailer (noun)	speaker (noun)
a mourner who utters long loud high-pitched cries	electro-acoustic transducer that converts electrical signals into sounds loud enough to be heard at a distance
	someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)