Furtherance rhymes with:
beligerence, belligerence, conference, deference, deliverance, difference, endurance, exuberance, ignorance, indifference, inference, intolerance, irreverence, preference, protuberance, reference, reverence, self-deliverance, severance, temperance, tolerance, utterance
Furtherance sounds like:
fraternize, frittering, furthering