Pioneer rhymes with:
auctioneer, bioengineer, conventioneer, domineer, electioneer, engineer, imagineer, lanier, mutineer, reengineer, souvenir, veneer, wagoneer
Pioneer sounds like:
pamer, pamour, panaro, panmure, pannier, panora, paymer, penner, penoyer, penry, penury, pfiffner, pineiro, piner, pinero, pinheiro, pinner, pomeroy, pommer, pommier, pomroy, poyner, poynor