society > armed hostility > defence > defensive work(s) > castle or fortified building > [noun] > small castle (7)
A stronghold, a castle, esp. a small castle or tower; = peel, n.2 3. Also figurative. Now archaic and rare.
A castle; esp. a small castle or tower; = pile, n.2 Obsolete.
A little castle; the name of an ancient prison in Paris.