Protuberance rhymes with:
exuberance, exuberance, beligerence, belligerence, conference, deference, deliverance, difference, endurance, exuberance, furtherance, ignorance, indifference, inference, intolerance, irreverence, preference, reference, reverence, self-deliverance, severance, temperance, tolerance, utterance
Protuberance sounds like:
port-au-prince, port_au_prince, protuberances