| AIRPROOFS | • airproofs v. Third-person singular simple present indicative form of airproof. • AIRPROOF v. to make impermeable to air. |
| FERVOROUS | • fervorous adj. With fervour; fervent. • FERVOROUS adj. full of fervor. |
| FIREROOMS | • firerooms n. Plural of fireroom. • FIREROOM n. a room containing a ship's boilers. |
| FOREGOERS | • foregoers n. Plural of foregoer. • FOREGOER n. one who goes before another; a predecessor. |
| FORESHORE | • foreshore n. Synonym of intertidal zone. • FORESHORE n. that part of the shore that lies between the low and high tide marks. |
| FORESWORE | • foreswore v. Simple past tense of foreswear. • FORESWEAR v. to renounce, also FORSWEAR. |
| FORESWORN | • foresworn v. Past participle of foreswear. • FORESWEAR v. to renounce, also FORSWEAR. |
| FOREWORDS | • forewords n. Plural of foreword. • FOREWORD n. an introductory statement. |
| FORMWORKS | • formworks n. Plural of formwork. • FORMWORK n. boxes for holding setting concrete. |
| FOURSCORE | • fourscore num. (Now archaic) Eighty. • fourscore num. (Idiomatic) A full-length life, reckoned as eighty years. • fourscore n. A quantity or amount of eighty. |
| FROSTWORK | • frostwork n. Any naturally occurring intricate pattern of ice crystals. • frostwork n. Any pattern that resembles a frost formation. • FROSTWORK n. tracery made by frost, e.g. on windows. |
| FROUFROUS | • froufrous n. Plural of froufrou. • frou-frous n. Plural of frou-frou. • FROUFROU n. (French) the rustling of silk; frills or decoration. |
| HOARFROST | • hoarfrost n. Alternative form of hoar-frost. • hoar-frost n. Alternative form of hoar frost. • hoar␣frost n. Originally, any frozen dew forming a white deposit on exposed surfaces. |
| PROFESSOR | • professor n. The most senior rank for an academic at a university or similar institution, informally also known as… • professor n. (US, informal) A teacher or faculty member at a college or university regardless of formal rank. • professor n. (Archaic) One who professes something, such as a religious doctrine. |
| PROFORMAS | • proformas n. Plural of proforma. • pro␣formas n. Plural of pro forma. • PROFORMA n. an invoice made out to show the price of goods, the goods being paid for before dispatch. |
| ROOFTREES | • rooftrees n. Plural of rooftree. • roof␣trees n. (Archaic) plural of roof tree. • ROOFTREE n. a horizontal timber in a roof. |
| RUSTPROOF | • rustproof adj. Resistant to rust, oxidation and corrosion. • rustproof adj. Resistant to the rust fungus. • rustproof v. To make resistant to rust, such as by applying a coating. |
| SORROWFUL | • sorrowful adj. (Of a person) exhibiting sorrow; dejected; distraught; sad. • sorrowful adj. Producing sorrow; causing grief. • SORROWFUL adj. sad. |