fortress /förˈtrəs or fōrˈ/

1. A fortified place
2. A defence

To guard

• subbureaus
• subbureaux
• Subbuteo
• subby
• subcabinet
• subcabinets
• subcaliber
• subcalibre
• subcantor
• subcantors
• subcapsular
• subcardinal
• subcardinals
• subcarrier
• subcarriers
• subcartilaginous
• subcaste
• subcastes
• subcategories
• subcategory
• subcaudal
• subcavities
• subcavity
• subceiling
• subceilings