- focusA point at which reflected or refracted rays of light converge.
- fuelSubstance consumed to provide energy through combustion, or through chemical or nuclear reaction.
- foyerSuch a space used in a hotel, theater, etc.
- focacciaA flatbread similar in style, composition, and texture to modern pizza doughs and topped with herbs, cheese and other products. Focaccia typically consists of high-gluten flour, oil, water, sugar, salt and yeast.
- fusilA bearing of a rhomboidal figure, originally representing a spindle in shape, longer than a heraldic lozenge.