Stronghold vs. Fortress
Difference Between Stronghold and Fortress
A place built to withstand attack; a fortress.
A fortified place; a large and permanent fortification, sometimes including a town; for example a fort, a castle; a stronghold; a place of defense or security.
(figuratively) A place of domination by, or refuge or survival of, a particular group or idea.The last stronghold of the Cornish language.
(chess) A position that, if obtained by the weaker side, will prevent penetration by the opposing side, generally achieving a draw.
a strongly fortified defensive structure
(transitive) To furnish with a fortress or with fortresses; to guard, to fortify.
a fortified defensive structure