Decisionmaking rhymes with:
basketmaking, bookmaking, dealmaking, dressmaking, filmmaking, glassmaking, homemaking, lawmaking, matchmaking, moneymaking, moviemaking, papermaking, peacemaking, policymaking, printmaking, rulemaking, steelmaking
Decisionmaking sounds like:
decommissioning, deukmejian's, diagnosing, disengaging, disingenuous, dismissing