Here's what rhymes with competency.

Consider these alternatives

competencies / incompetencies evaluations / relations evaluation / relation qualifications / relations suitability / stability exam / than examinations / relations conformance / performance examination / information certification / education acuity / continuity evidentiary / residentiary materiality / personality truthfulness / usefulness interoperability / stability retardation / operation purity / security admissibility / ability impartiality / personality validation / operation skill / will reliability / ability