noser
/ˈnəʊzə/noun
1A prying or inquisitive person, a person who seeks out; specifically ( slang ) an informer or spy for the police.
2 Distilling. A person employed to assess or maintain the quality of an alcoholic drink (especially whisky) by inhaling the aroma; specifically a master distiller.
Origin
Mid 18th century (in an earlier sense). From nose + -er.