butterfly nut vs thumbnut

butterfly nut and thumbnut both are nouns.

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

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

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

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

butterfly nut (noun)	thumbnut (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