engeneering engine-turn engineering fine-tuning fire-engine freerunning frenigerent frugiferent greenfinger interferent interfering interfinger interfungin intergerine interregent intertenure ngiri-ngiri niningerite re-engineer re-entering refrigerent reigning-in reinterring rereferring rin-tin-tin ring-finger tur-turring tut-tutting tuttifrutti unfettering unfurniture unigeniture unreferring unreturning untittering