| DEFROSTERS | • defrosters n. Plural of defroster. • DEFROSTER n. something that defrosts. |
| EFFORTLESS | • effortless adj. Without effort. • EFFORTLESS adj. showing or requiring little or no effort. |
| FEEDSTOCKS | • feedstocks n. Plural of feedstock. • FEEDSTOCK n. raw material used in an industrial process. |
| FETOSCOPES | • fetoscopes n. Plural of fetoscope. • FETOSCOPE n. an instrument used for looking at the fetus. |
| FIRESTONES | • firestones n. Plural of firestone. • Firestones prop.n. Plural of Firestone. • FIRESTONE n. a rock, esp. sandstone, that can withstand great heat. |
| FOETIDNESS | • foetidness n. The quality of being foetid. • FOETIDNESS n. the state of being foetid. |
| FORESHEETS | • foresheets n. Plural of foresheet. • FORESHEET n. a rope used for trimming the foresail; the space near bow of open boat. |
| FORESTAGES | • forestages n. Plural of forestage. • forestages v. Third-person singular simple present indicative form of forestage. • FORESTAGE n. a duty or tribute payable to the king's foresters. |
| FORESTLESS | • forestless adj. Without a forest. • FORESTLESS adj. without a forest. |
| FORESTRIES | • forestries n. Plural of forestry. • FORESTRY n. the science of planting and managing forests. |
| FORETASTES | • foretastes n. Plural of foretaste. • FORETASTE v. to taste in advance. |
| FORTRESSED | • fortressed v. Simple past tense and past participle of fortress. • FORTRESS v. to strengthen with a fortress. |
| FORTRESSES | • fortresses n. Plural of fortress. • fortresses n. Plural of fortresse. • FORTRESS v. to strengthen with a fortress. |
| FOSTERAGES | • fosterages n. Plural of fosterage. • FOSTERAGE n. the care of a foster child. |
| FOSTRESSES | • fostresses n. Plural of fostress. • FOSTRESS n. a woman who feeds and cherishes; a nurse. |
| FREESTONES | • freestones n. Plural of freestone. • Freestones prop.n. Plural of Freestone. • free-stones n. Plural of free-stone. |
| SETIFEROUS | • setiferous adj. Having bristles; bristly. • SETIFEROUS adj. bearing bristles, also SETIGEROUS. |
| SOFTNESSES | • softnesses n. Plural of softness. • SOFTNESS n. the state of being soft. |
| STONEFLIES | • stoneflies n. Plural of stonefly. • STONEFLY n. a winged insect. |