償却 （ショウキャク） repayment, redemption, depreciation, amortization, amortisation

償還 （ショウカン） repayment, redemption, amortization, amortisation

無償 （ムショウ） without compensation, without reward, without pay, free (of charge)

有償 （ユウショウ） (involving) payment, (involving) compensation, paying a fee

償う （つぐなう） to make up for, to compensate for, to indemnify, to recompense, to redeem (e.g. a fault), to atone for