WordNet sense 1 (a television reporter who coordinates a broadcast to which several correspondents contribute):

anchorman, anchorperson

WordNet sense 2 (a central cohesive source of support and stability):

backbone, keystone, linchpin, mainstay, lynchpin

WordNet sense 3 (a mechanical device that prevents a vessel from moving):

ground tackle

WordNet sense 4 (fix firmly and stably):

ground

WordNet sense 5 (secure a vessel with an anchor):

cast anchor, drop anchor