choo-choo chop-chop chorology chorrocho clop-clop clot-poll collotypy colo-colo colpotomy coolcolor coprology coptology crycrycry cyclogyro cyclothym cyclotomy cytolymph cytoproct glottolog glycocoll gorgoroth groo-groo gyrotropy hollyholm holomorph holophyly homoglyph homomorph homophyly homotropy hoplology hotch-pot hothothot hottotrot hygrology hypocotyl hypomorph loco-loco locomotor logrhythm lolly-pop lorry-hop lyth-coop moco-moco mommoppop moolooloo mortcloth motorloop motorpool mycotroph mythology octothorp ogoh-ogoh optomotor orchotomy oromoromo orthology orthotomy photocopy photology photoloop phototool phototypy phycology phytology phytotomy poco-poco polycotyl polymorph polymythy polyphyly polyptych polytroch polytroph poochcoop pooh-pooh porphyro- port-mort pot-color poto-poto prompromo proprotor protocorm protology protoloph pyromotor roly-poly roocoocoo rory-tory tcho-tcho thoothoor thymology thyrotomy tommy-rot top-cloth tory-rory trolltoll tropology typtology tyroglyph