What's the noun for banjo? Here's the word you're looking for.
banjo
(music) A stringed musical instrument (chordophone) with a round body, a membrane-like soundboard and a fretted neck, played by plucking or strumming the strings; by extension, any musicologically similar instrument, like the Tuvan doshpuluur, with a membrane-like soundboard.
(slang) An object shaped like a banjo, especially a frying pan or a shovel.
(Britain, Dagenham) A cul-de-sac with a round end.