1. guardhouse - Noun
2. Guardhouse - Proper noun
A building which is occupied by the guard, and in which soldiers are confined for misconduct; hence, a lock-up.
Source: Webster's dictionaryCharles Kenyon, with the group Civil War Friends of Alcatraz, stands below the sally port and guardhouse during a tour of newly restored areas on Alcatraz Island Wednesday, July 1, 2015, in San Francisco. Source: Internet
"The guard was sound asleep when Tip arrived at the guardhouse," Sadow said, using the rapper's nickname. Source: Internet