magnum opus /magˈnəm ōˈpəs, magˈnŭm opˈŭs/ (Latin)

1. A great work, esp of literature or learning
2. A writer's greatest achievement or the culmination of his or her efforts

• fipple flute
• fipple flutes
• fipples
• fiqh
• fir
• fir cone
• fir cones
• fire
• fire alarm
• fire alarms
• fire and brimstone
• fire-and-brimstone
• fire and sword
• fire ant
• fire ants
• firearm
• firearms
• fire-arrow
• fire-arrows
• fire away
• fireback
• firebacks
• fireball
• fire-balloon
• fire-balloons