Synonyms of the word

donjon

• n. The fortified tower of a motte or early castle; a keep.

dungeon

• n. An underground prison or vault, typically built underneath a castle.
• n. (obsolete) The main tower of a motte or castle; a keep or donjon.
• n. (games) An area inhabited by enemies, containing story objectives, treasure and bosses.
• n. (BDSM) A room dedicated to sadomasochistic sexual activity.
• v. (transitive) To imprison in a dungeon.

fastness

• n. A secure or fortified place; a stronghold, a fortress.
• n. The state of being fast.
• n. The ability of a dye to withstand fading.

keep

• v. To continue in (a course or mode of action); not to intermit or fall from; to uphold or maintain.
• v. (heading, transitive) To hold the status of something.
• v. (heading, intransitive) To hold or be held in a state.
• v. (obsolete) To wait for, keep watch for.
• v. (intransitive, cricket) To act as wicket-keeper.
• v. (intransitive, obsolete) To take care; to be solicitous; to watch.
• v. (intransitive, obsolete) To be in session; to take place.
• v. (transitive) To observe; to adhere to; to fulfill; not to swerve from or violate.
• v. (transitive, dated) To confine oneself to; not to quit; to remain in.
• v. (transitive, dated, by extension) To visit (a place) often; to frequent.
• n. (obsolete) Care, notice.
• n. (historical) The main tower of a castle or fortress, located within the castle walls. (According to, the…
• n. The food or money required to keep someone alive and healthy; one's support, maintenance.
• n. The act or office of keeping; custody; guard; care; heed; charge.
• n. The state of being kept; hence, the resulting condition; case.
• n. (obsolete) That which is kept in charge; a charge.
• n. (engineering) A cap for holding something, such as a journal box, in place.

stronghold

• n. A fortress.
• n. A place of refuge, survival or domination by a particular group or idea.