cardinal
n.— «Istook gained even more influence after being named a so-called “cardinal,” the moniker given to those who chair an appropriations subcommittee.» —“Istook says no to run for governor” by Jim Myers Tulsa World (Okla.) May 16, 2001. (source: Double-Tongued Dictionary)
Further reading
What if, instead of being an inanimate object, a dictionary were alive? That’s the idea behind a lavishly illustrated new children’s book called The Dictionary Story (Bookshop|Amazon) by Oliver Jeffers and Sam Winston. This is part of a...