wing nut vs butterfly nut

wing nut and butterfly nut both are nouns.

Word	Noun	Adjective	Verb	Adverb
wing nut	Yes	No	No	No
butterfly nut	Yes	No	No	No

As nouns, wing nut and butterfly nut are synonyms defined as:

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

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

wing nut (noun)	butterfly nut (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