roll call vs utterance

roll call and utterance both are nouns.

Word	Noun	Adjective	Verb	Adverb
roll call	Yes	No	No	No
utterance	Yes	No	No	No

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

Other hypernyms of roll call include vocalization.

roll call (noun)	utterance (noun)
calling out an official list of names	the use of uttered sounds for auditory communication