Here's what rhymes with greywacke.
shock hoc hawk sock hock stock talk rock walk flock knock lock chalk cock dock mock stalk frock loc doc balk doch loch smock chock pock bock gawk jock mach wok calk caulk choc schlock shlock block clock bloc proc crock squawk restock unlock macaque hollyhock leafstalk shoptalk windsock manioc tomahawk aftershock overstock sparrowhawk hammerlock backtalk moonwalk ballcock interlock electroshock laughingstock antiknock poppycock Words that almost rhyme with greywacke
fog hog dog log frog bog cog jog smog flog jag slog wog snog blog clog grog agog befog sprog quahaug defog prolog dialogue catalogue analog synagogue analogue epilogue travelogue epilog synagog unclog travelog pettifog monologue demagogue pedagogue underdog monolog pedagog demagog fork shark hark honk dark mark park bark spark mosque pork stark torque cork lark barque marque porque stork manque dork bonk conk nark narc wank wonk remark quark bronc embark oligarch debark uncork patriarch matriarch paperbark reembark tidemark fingermark disembark watermark meadowlark