laughter vs utterance

laughter and utterance both are nouns.

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

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

Other hypernyms of laughter include vocalization.

laughter (noun)	utterance (noun)
the activity of laughing; the manifestation of joy or mirth or scorn	the use of uttered sounds for auditory communication
the sound of laughing