What is another word for "fort"?

Roget's Thesaurus (1911) lists these synonyms for "fort": abstract, ace, age, agnostic, agnosticism, alien, alone, and, antichristian, antichristianity, apart, are, arms, atheism, atheist, atheistic, atomic, authority, azygous, beat, belief, bigwig, bout, but, carnal, combine, compact, dechristianize, deism, deist, deistical, desolate, devoutless, dine, disbelief, disbelieve, disjoin, disjunction, doubt, dreary.