U-boat /ūˈbōt or (German) ooˈ/

A German submarine

• for the worse
• forthgoing
• forthgoings
• forthink
• forthinking
• forthinks
• forthought
• forth-putting
• forthright
• forthrightly
• forthrightness
• forthrightnesses
• forthrights
• forthwith
• forthy
• forties
• fortieth
• fortieths
• fortifiable
• fortification
• fortifications
• fortified
• fortifier
• fortifiers
• fortifies