| AFORETHOUGHTS | • AFORETHOUGHT n. a premeditation. | 
| AFTERTHOUGHTS | • afterthoughts n. Plural of afterthought. • AFTERTHOUGHT n. an idea occurring later. | 
| COUNTERSHAFTS | • countershafts n. Plural of countershaft. • COUNTERSHAFT n. an intermediate shaft driven by the main shaft. | 
| FLUORAPATITES | • fluorapatites n. Plural of fluorapatite. • FLUORAPATITE n. a mineral consisting of calcium phosphate fluoride, the most common form of apatite. | 
| FLUOROACETATE | • fluoroacetate n. (Chemistry) Any salt of fluoroacetic acid. • FLUOROACETATE n. an organofluorine compound. | 
| FLUTTERBOARDS | • flutterboards n. Plural of flutterboard. • FLUTTERBOARD n. a kind of swimming aid, a kickboard. | 
| FORTUNATENESS | • fortunateness n. The quality of being fortunate; fortune; luck. • FORTUNATENESS n. the state of being fortunate. | 
| FREQUENTATION | • frequentation n. The act of frequenting a particular place. • FREQUENTATION n. the act of frequenting. | 
| FRUMENTATIONS | • frumentations n. Plural of frumentation. • FRUMENTATION n. a gift of grain bestowed on starving or rebellious people in ancient Rome. | 
| PUTREFACTIONS | • putrefactions n. Plural of putrefaction. • PUTREFACTION n. rotting. | 
| SUPERFETATION | • superfetation n. The formation of a fetus while another fetus is already present in the uterus. • superfetation n. An excessive accumulation; a superfluous addition. • SUPERFETATION n. a second conception when there is already a fetus in the womb, also SUPERFOETATION. | 
| TETRAFLUORIDE | • tetrafluoride n. (Chemistry) Any chloride containing four fluorine atoms in each molecule. • TETRAFLUORIDE n. a fluoride containing four atoms of fluorine. | 
| UNFORGETTABLE | • unforgettable adj. Very difficult or impossible to forget. • UNFORGETTABLE adj. incapable of being forgotten. | 
| UNFORGETTABLY | • unforgettably adv. In an unforgettable manner; very memorably. • UNFORGETTABLE adv. incapable of being forgotten. | 
| UNFORTUNATELY | • unfortunately adv. Happening through bad luck, or because of some unfortunate event. • unfortunately adv. Used (as a parenthetical word) to express disappointment, compassion, sorrow, regret or grief. • UNFORTUNATE adv. not fortunate. |