wing-nut vs wing screw

wing-nut and wing screw both are nouns.

Word	Noun	Adjective	Verb	Adverb
wing-nut	Yes	No	No	No
wing screw	Yes	No	No	No

As nouns, wing-nut and wing screw are synonyms defined as:

wing-nut and wing screw: a threaded nut with winglike projections for thumb and forefinger leverage in turning

Other synonyms of wing-nut include butterfly nut, thumbnut, wing nut.

wing-nut (noun)	wing screw (noun)
a threaded nut with winglike projections for thumb and forefinger leverage in turning	a threaded nut with winglike projections for thumb and forefinger leverage in turning
any tree of the genus Pterocarya; fruit is a small winged nutlet; Caucasus to southeastern Asia