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