Origin: Latin suffix -ure
Cynosure has 3 different meanings across 1 category:
something that provides guidance (as Polaris guides mariners)
"let faith be your cynosure to walk by"
something that strongly attracts attention and admiration
"if he was the cynosure of all eyes he didn't notice"
Ursa Minor or Polaris, the North Star, used as a guide by navigators.