Ordnance rhymes with:
abstinence, chrominance, comfinance, countenance, dissonance, dominance, eminence, governance, immanence, imminence, incontinence, luminance, maintenance, ordinance, penance, permanence, predominance, preeminence, prominence, provenance, resonance, sustenance
Ordnance sounds like:
orations, ordaining, ordinance, ordinances, ordnance's, ordonez, ortenzio, ortomisio