speaking vs utterance

speaking and utterance both are nouns.

Word	Noun	Adjective	Verb	Adverb
speaking	Yes	Yes	No	No
utterance	Yes	No	No	No

As nouns, utterance is a hypernym of speaking; that is, utterance is a word with a broader meaning than speaking:

Other hypernyms of speaking include vocalization.

speaking (noun)	utterance (noun)
delivering an address to a public audience	the use of uttered sounds for auditory communication
the utterance of intelligible speech

speaking (adjective)	utterance (adjective)
capable of or involving speech or speaking
capable of speech