Synonyms for Wing Nut (same or very similar meaning)
WordNet sense 1 (any tree of the genus Pterocarya; fruit is a small winged nutlet; Caucasus to southeastern Asia):
wing-nutWordNet sense 2 (a threaded nut with winglike projections for thumb and forefinger leverage in turning):
thumbnut, butterfly nut, wing screwFrom the ODE community, based on WordNetadd/edit