wonk

1. (derogatory, informal) An overly studious person, particularly a student.Examples: "Previously, e-reading had been the domain of early adopters and new technology wonks."Synonyms: nerd, dork, flabbergast, flabagast, flabaghast, gink, nerd, Nigelderogatoryinformal

2. (by extension, informal) A policy wonk or other intellectual expert.Examples: "This is the sort of standard that the Paul Ryans of the world trumpet to their constituents, to potential campaign contributors and to their peers in Congress. They become “budget wonks” and political superstars, even if their proposals are bound to go nowhere."broadlyinformal