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