Deficiency rhymes with:
efficiency, inefficiency, efficiency, immunodeficiency, inefficiency, proficiency, self-sufficiency, sufficiency, efficiency, immunodeficiency, inefficiency, proficiency, self-sufficiency, sufficiency
Deficiency sounds like:
debasing, debugging, defacing, defeasance, deficiencies, defusing, devising, diffusing, division's, divisions, divisions', dobkins, dobson's, dobsons