Wiktionary
stridencies
n. (plural of stridency English)
Usage examples of "stridencies".
But the same couldn't be said for the hissing of pressure relief valves or the metallic clanks and stridencies that prefaced the slow rise of the pod's uncommonly large, circular forward hatch.
At worst they made a clangor of unrelated stridencies, which they could not distinguish from their best.