lecturer vs utterer

lecturer and utterer both are nouns.

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

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

lecturer: someone who lectures professionally
utterer: someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)

Other hypernyms of lecturer include speaker, talker, verbaliser, verbalizer.

lecturer (noun)	utterer (noun)
someone who lectures professionally	someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)
a public lecturer at certain universities	someone who circulates forged banknotes or counterfeit coins
	an organism that can utter vocal sounds